I'm not as good at game as you all, but i can see AI flaws sometimes. Still for me it's not so bad, and like it was once said, it is for the vast majority of players, especially casual. Firaxis maybe also thinks that way. And i still don't understand why people complain about AI not using planes? In my game AI always builds and uses planes and nukes. And i play mostly on king. It's strange that ai don't do it on high difficulties.