Well one of the origonal problems and complaints about CTP2 was its nearly dormant AI. So it became the Holy Grail of the Mod makers to try to make it more agressive, to atleast make the game more of a challange - which it now is.
Still its one of the things that is going to be resolved with the source code now released.
Also the higher the difficulty level, the more agressive i think the AI behaves. Try playing a game whereby you choose the AI civs you play against(you can do this in the multiplayer mode), and pick the ones you think might be less aggressive(like Babylon etc).
Keep in mind that this game has been on an on-going evolution since it was released - there were problems with it right from the begining and i suppose you could say its now in its 'teenage' era, hopefully with care and attention the clever folks working on the code will see it develope into the 'mature' game we all want to play
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