Personally I would prefer an AI that is capable of launching better campaigns. Currently if they are in a war (either with the human player or other AI players), they just sit back, build an insane Stack Of Doom (tm) and then pick a poorly defended world and attack. If the fleet ends up getting pulverized, it will retreat and the AI waits a while before retreating. If the fleet wins it destroys whatever colony world, and then goes back to doing whatever it usually does.
One game, the Alkari were a small, weak empire who were at war the humans (and pretty much everyone else) for most of the game. For some reason the other AI players (in particular the humans, who had 5 times as many systems and 20 times the number of ships, all with much better tech) never attacked the Alkari, by all rights the humans or the meklars should have wiped the floor with them, but they didn't. I would prefer to see an AI that wouldn't do something like this, but the tradeoff would be no AI production advantages.
Is that kind of thing even possible?