After each game, I always make sure to checks the graphs, and it seems to me that - particularily for TEC AI - they produce far, far too many scout frigates, especially in the late game. I don't know about anyone else, but when I've got an opponent creeping in on me, taking out my planets, the last thing I'm going to do is build 5-10+ scouts to verify which planets they're controlling.
Also, it seems that - again, from looking at postgame graphs - the AI hordes cash rather than spending it; they consistently seem to have thousands of credits and material resources in reserve.
Has anyone else noticed this?