I have once seen an AI do something very interesting - and then screwing it up. I have entered an enemy star system with quite large fleet, but of course there were the transit effects to deal with. Twelve enemy ships have begun firing their Gauss cannons at me, dealing huge damage to my armor. I was ready to lose half my vessels, but the enemy just moved away and begun using his missiles. The problem was, my warships had not only heavy armor, but also a lot of Gauss cannons of their own, and in the end I have suffered no loses. If the NPR continued to use his point defense offensively, this would have been a great battle, but as it is I killed them all without much problems.
Another interesting thing was me trying to intercept a group of twenty some colony ships. They were slightly faster than my warships and I was hoping to use my Gauss cannons against them to conserve munitions. I've got my wish - because the NPR decided to try and ram my forces. Surprisingly it took two such colony ships (each massing twenty five thousand tonnes) to destroy a single destroyer escort massing thirteen thousand tonnes. I think collision damage needs some recalculating. After all, a FAC traveling at ten thousand kps slamming into a target deals only twenty points of damage, which is not much.