I recently got into Supreme Commander, and just doing some 4-on-4 (7 of them AI's) skirmishes on Seton's Clutch, I've discovered the dreaded tendency of the stock AI's to get jammed up with units. I've also noticed when playing games with "no nukes" and "no game-enders", the AI is still building strategic missile defenses... which would seem to be a complete waste of resources.
I did a quick search of the forum for "AI mod" and it does look like some exist. I'm wondering if there are any that are highly-regarded by a consensus of the board?