I agree with Arralen. In fact imo we will see very good AIs in a couple of years, when most of the players will have a decent PC to run the AI processes fast enough.
Right now, many people have some low end machines still, running complicated AI processes on those would take enormous amount of time. My brother is playing a football manager game [his kids are also loving it, but they are too young to play, so mainy they are only watching their father as he is playing..
], and in that game, he can choose what leagues to play in. When he runs 60+ leagues for example, even on a dual proc. high end pc, it takes 10-20 mins to process 1 weekend "turn" in the game. I guess the present day comps are still not ready to run these huge processes.