Best AI in a Game? Suggestions?

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Hey everyone, I was doing a bit of thinking about AI, and pretty much AI in most games I've played recently aren't much better than games I've played when I started.

In fact yesterday during a nostalgia run through of Populous: The Beginning, I noticed the AI brought back units from distant posts when it's main base was attacked, and was generally being clever and giving me a hard time.

Civilization IV is another I was quite impressed with, especially when a peaceful AI declared war on me near the end-game. That kind of behaviour (whilst common sense) was also discussed in my Microeconomics course of 'Game Theory' on games with finite turns - not with video games in mind, but considering human behaviour, so I was impressed when this AI back stabbed me.

In shooters I remember UT2004 had some awesome godlike AI. If you slowed the game down to 20% speed you could clearly see them dodging rockets or flak in close quarters (reminds me of agents in the matrix).


Now.. the thing is, the AI in RTS's tend to be hard because of either a) a very rigid but optimal script written by a human, ie. base layout and order of moves, planned attacks. or b) the above plus essentially cheating, faster resource gathering, unit output, eg. SupCom

Does anybody know of any games which are more impressive, or which specifically designate more resources for the AI, AI focused games?

The bottom line is, hardware has changed, graphics are better, computing power is greater than when I played Populous for the first time on a CRT, so what's with the AI? Everthing might be NEXT GEN and HD but I still see units getting stuck at path-finding and no major AI breakthroughs (to my knowledge)

Addition: I'm really impressed with GTA IV's civillian AI, combined with the physics engine. Seeing people stumble and try to hold on, or cars both obeying traffic laws, and driving around obstacles you might place before them is quite good.

Addition 2: AI glitches are welcome for discussion too, I present to you Oblivion "I love dogs"
 
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On BO they aim at your the same speed regardless of setting. On Veteran they just shoot instantly though.
 
Oblivion was a funny one for AI - during development they had to dial it back as it would get overly complex with every active NPC running off with their own agenda causing unintended cause and effect and eventually putting a huge load on the CPU.

You can still use the dev console to clone an NPC based on your ingame character and it will run off of its own accord and start doing missions itself lol - not sure the full extent of its behavior but it appeared like it would actually run off and do the entire game itself but not positive on that.
 
beyond the standard FPS settings of make the enemy inhumanly quick reactioned i too have to say ArmA2, particularly with zues AI. The enemy will if attacked put down surpressing fire and flank, screen movement, move from cover to cover. They will ambush you if spotted first they will call in artillery or other assets. their air units will move and groove to dodge fire etc etc. Most believeable AI iv faced yet.
 
AI in LoL is rather interesting on intermediate games, the teams are designed to work together to push the human player. Shame riot hasn't worked on more teams or harder levels of AI.
 
I remember being impressed by the enemy trooper ai in the original Fear. Enemies flank, will go back and find alternate routes to get to you and work together to flush you out.
Repetitive game in terms of level deisgn but the weapons are great, the combat is very solid and the ai can be fun to play with.
 
arma2 in terms of how well they can deal with various situations

crysis 2 deserves a mention but not as complex as arma2 imo
 
I remember Farcry 2's AI being pretty damn good. They'd stick together, flee their camps to flank you, squat in bushes and try and find you if you were going sniper. Great fun.
 
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