Competent ai is hard to program. Unfair or too clever ai doesn't make for a good gaming experience and the same goes if its too dumb. I'd imagine devs trying strike a good middle ground for normal difficulty and leave it be. The worse ones are ones that track you through walls and basically everywhere in the map. And those that dodge and cheese your special moves with frightening accuracy. Then you have ranged enemies that have laser focused aim no matter the distance - seriously why do games have this. And enemies that come at you like fodder with no fear of death.
The one thing I do want now we have vastly better CPU's in the new consoles.. is more varied and more personalized Ai. NPC and enemies with independent emotions that can act on their own accord and realistically reacting to the players actions, just as they would in real life. The one immersion breaker for me is stopping in front of NPC's and doing their thing and getting no reaction. Zilch. No adjusted movement, physically or verbally to place you by the in world by the NPC. And in lets say a shooting game, enemies death charge at you with no fear or death. I'd want NPC/enemies to behave differently depending on a players actions, environment and situation instead of following simple scripted reactions and movements we get in a lot of games.
