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The lighter side of the Left 4 Dead zompocalypse

An open letter to the L4D2 team

So. I’ve had Left 4 Dead 2 for what… 15 hours? Due to the expected release-day bugs and my own day-to-day life (i.e. school)  I’ve only been able to play for a total of about three; I’ve got through the first two campaigns, and the first section of the third.

But one serious problem has become apparent to me. In fact, I saw it in the demo, and hoped it would be resolved… Alas, it has not. I’m talking about the survivor AI.

As I’m sure you’ll know, Left 4 Dead’s survivor AI was the butt of many jokes on the internet. I don’t think it was all that bad, and I certainly hoped that it would be improved for L4D2. Alas, I have been proven wrong.

I can understand some of the AI’s weaknesses compared to a human player, even though I don’t like them; things like chest paddles, ammo upgrades, explosives and carryable items are too situational to be used effectively by an AI. I can also understand the AI not being able to help carry fuel cans for the Dead Center finale. But the AI in Left 4 Dead 2 have several flaws which simply serve to irritate, and to make the game much harder than it needs to be,

For starters they seem generally slower to respond, and a bit stupider. They seem to take longer to rescue you from special infected, choosing to run up and melee or shoot and point blank range rather than shooting while they are further away. I can understand this with jockeys, but with chargers and smokers especially they should be shooting; the charger offers a huge target, and the smoker will often be far away from the player. if they have a clear line of sight, they should shoot from a distance. They can’t friendly fire anyway! Additionally, when I first got to the Dark Carnival finale, the AI went the wrong way. I got to the helicopter, turned and they were on the opposite side of the arena. I tried covering them, but they seemed to be making no efforts to get to me. Eventually they got incapped, and just as the helicopter started to leave a common infected came THROUGH THE BOTTOM of the helicopter and incapped me. Even as the leaving animation played, I was sent back to the saferoom.

There is a larger problem, though. The AI seem very stupid when it comes to picking up items; they are, in my experience, far too likely to all end up with the same gun, along with a host of other problems. As I said, I fully understand the fact that they can’t carry ammo upgrades or defibs. But the fact that they are in the game creates a new choice for me; do I carry a healthkit or one of those? This would be made easier if I could rely on the AI to carry healthkits for me, but the problem is I CAN’T. I don’t know how many times I’ve been standing in front of a healthkit, often spamming “look” at it, with three AI with empty inventory slots staring at me blankly. I’ve even had Rochelle standing ON TOP of a healthkit, somehow unable to see it or pick it up despite not having one.

When I’m leaving a saferoom with only one healthkit carried between the four of us, there should NOT be another healthkit left sitting on a table beside the door. There’s no reason that I can see for the AI to be leaving it there. When I walk past two healthkits within 5 minutes, and neither gets picked up, there’s a serious problem with the AI.

Unless, of course, you mean this to happen, perhaps as some kind of balancing.  But for goodness sake, that’s a really, really silly way of doing it. it just infuriates players who have to deal with incompetent AI. Balance by making the Charger harder to kill (he’s pathetically easy compared to, say, the jockey) or by altering the damage values. Not by making the AI stupid, which doesn’t even carry over into Multiplayer!

I understand that Left 4 Dead is a mainly multiplayer game. But if I choose to play single player for whatever reason, I should be able to play without these kinda issues with the AI. Not only that, but this rears its ugly head in multiplayer as well.

This letter will be posted on the the ubercharged.net forum, Boomercharged.net and the Steam forums, as well as being emailed to Valve.

Yours sincerely

Phoenix
Ubercharged/boomercharged editor
phoenix@ubercharged.net

 

20 Responses to “An open letter to the L4D2 team” (post new)

  1.  

    Yeah….

    Now do you understand my comments when is aw you playing in singleplayer? :P

    But yes, truly the singleplayer of L4D2 is the weakest point of the game, and the problems with the AI are quite a good part of it. I have to say though, that most of those AI errors seem to disappear when you are playing with at least one more person.

  2.  

    Would be interested to see their response.

    Hope for a patch?

  3.  

    I agree with this.

    I had to replay the mall level about 5 times until I have up and lowered the difficulty.
    The normals where no problem, what was killing me was a smoker/charger grabbing me and making me fall down a floor.
    The AI would just run towards me, not use their sniper rifles, but instead walk up to the charger point blank with pistols.

    At least I liked that them rescuing you from being incapped cannot be stopped by me getting hit by a zombie.

  4.  

    +1. Biggest issue I have is how they deal with special Infected who’ve successfully attacked me. It’s a sniper rifle, it’s a long range weapon, USE IT!!!

  5.  

    Just thought of another one, though it’s from the demo and is really the only thing in the demo that drove me crazy: the alleyway before the trailer. I’d crouch-walk up to it and strafe a little in order to pick off the Infected one by one, clear out the open area between the alley and the trailer. But without fail, it’d be the first time the survivor AI decides to get ahead of me. Every other time they’re *decently* keeping up the pace behind me (I kind of got used to their pace and figured out where they’d normally be at each portion of the two maps), but at the end of that stupid alley they run up and stop right in front of my sniper shots, blocking my view and complaining about friendly fire, and more often than not a Smoker or Charger would grab them. Now they’re just ssssssssllllllllllllllllloooooooooowwwwwwwww. This is the first time I’ve ever had the urge to ask Valve for a patch.

  6.  

    The survivor AI is so bad I just wanna lay down and cry!

  7.  

    @Phoenix, can you post a link to your thread on the official forums. I’d like to follow the responses and comments on the steam forums.

    I agree with this post for the most part. When I played through Dead Center, it seemed much harder than the original L4D due to the fact that the A.I. lagged behind, and were slow to respond to special infected.

  8.  
  9.  

    Don’t know if you have seen this one: http://www.youtube.com/watch?v=VqyNS7ZdY1A
    It kind of summarize the whole AI problem nicely!

  10.  

    When I’m more scared of sniper rifles than the zombies because I know all 3 of the AI characters are gonna pick it up, you know your code sucks

  11.  

    Now while I did play the PC demo and can understand where you are coming from, the Xbox version does not have the won’t-grab-healthkit problem. Other than that you hit the nail on the head.

  12.  

    Let’s face it. Valve never intended to make Left 4 Dead 2 a single-player game.

  13.  

    I’m suprised you didn’t mention the AI’s biggest problem, they are absolutely useless on rolling crescendos because they try to stop and fight every single zombie. I’m pretty sure is impossible to get them through the endless crescendo at dark carnival 4 alive.

  14.  

    Yeah the AI in L4D2 still needs some work, I really hope they fix the AI. I’ve been playing single player until my friend’s version unlocks (damn UK release date), so I completely understand where your coming from. Although here are some things I’ve noticed while playing;

    They won’t pick up your medkit if you drop it. This seems to be to stop the AI nicking it and using it while your deploying the ammo, but messes them up when you choose the difib over the medkit.

    The AI in saferooms seem to be programmed to automatically use their medkits no matter their health (Rochelle healed at 82 health) just so no medkit is left in there.

    The AI seems to believe the adrenaline is to be used like the pills.

    The AI will pick up any gun of a higher tier than their current one, which can lead to having a team of all sniper rifles. Surely they can be programmed to check how many of that type of weapon the team has and act accordingly.

    So yeah you hit the nail on the head here. I’ve heard people say they are dumber than the original L4D bots, but I have to say they are on the same level, there’s just more going on in L4D2 (melee weapons, situational pick ups, running crescendos). That in my opinion is the problem, not that they are dumber but they haven’t been made smarter for all the new additions.

  15.  

    My guess is the code that sees them NEVER picking up things like the defib is messing with their decision making with medkits in some way, but I could be way off.

    Very annoying. Also, I never seem to remember the original cast quite so suicidal–I’ve had two characters JUMP to their deaths now.

  16.  

    So for me they never pick up the healthkit until i leave the saferoom. Then they take it as they leave. Took me a while to figure that out though. Lots of standing there hitting the look at the medkit button.

    But I like the bots for one reason. They tend to keep zombies off me. When I’m playing with all people, I get surrounded a lot because they don’t attempt to protect me as much.

  17.  

    I’ve had horrible experiences with the AI too. Like bots getting stuck for no reason at all and getting killed without even firing back at the zombies…

    The new AI is definitely in need of improvements and I hope Valve will patch this because I tend to play a lot with bots (not always all the bots but still) and it’s really a downward to the game.

    That, plus all the other bugs I spotted in the game that makes me feel I’ve been fooled on the product. And it’s quite expensive here in Europe.

  18.  

    They seem to have stripped out some of the logic from the AI as well from L4D. They are 100% dependent on a human player to guide them through the level, otherwise their AI consists of “grab thing, kill guy”. I think that it is intended to deter people from doing… what I do occasionally… and playing as special against the AI using the allow_all_bots console variable.

  19.  

    Something i can’t stand is when i’m playing expert with the bots…
    And a tank shows up…
    guess who stands there with a single pistol shooting him?
    and i quote ” run or shoot…RUN OR SHOOT!? ”
    ” both ”
    - L4D1
    Stupiud guys should atleast be able to ninja a thrown boulder or something for god sakes…

    and the witch is a fun character too…
    i sneak around, and, once again…
    bot fail…
    they stand around and take a piss on her (refrence)

    i’d love to have some ninja bots…
    or atleast ones that aren’t mentally retarded :)

  20.  

    hey guys, i just found this here when i did a fast yahoo search. Neat website you have here! Keep it up!

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