I don't think AI has ever impressed me in a game except maybe in the original Half-Life where they actually tried to flank you and flush you out with grenades. This in a time where the Stroggs in Quake 2 would keep running into walls :D
I don't think any developer have ever done AI quite right (except maybe Valve). No matter what game the AI always ends up doing something stupid that breaks immersion and just makes me LOL. Or in some cases (e.g. Far Cry) the AI acts like a computer and shoots you before they've even entered view distance.








