I have just finished another game. This one was 6 AI's, in teams of 3. Took 8 hours, could probably have been done faster, but I like to build the planets as I go along. I only built capital ships.
I gotta say I'm diappointed with the AI. Its way to easily beaten. It should be more persistent in its attacks. Instead of attacking and then withdrawing, and spend 10-20 mins to recover and then come back only to repeat itself, it should attack, and keep producing, and keep trying. It cant be right I actually built a static defensive and not even have to bother to check if the enemy is breaking in or at least weakening the defensive (actually destroying something...). I'd also stress some sort of cooperation between the AI allies. Like having them attack together and so forth.
Again a very average post from me, but I really think something should be done. Now I'm heading on to try the new beta and see if some of this has been fixed already 