I agree with you razorfett; having good AI makes the game a lot more immersive. In my opinion, I think the reason it hasn't been touched upon too much is because game developers focus much more on multiplayer (online) rather than singleplayer. Having a strong campaign is vital, however with the increase of online gaming, these seems to be where developers put more effort into. And of course because of this, the players you game against online replace any need for AI, as the AI is essentially a real person as appose to an artificial one. Just my outlook on it anyway.