Almost a year ago I posted a thorough example of AI's stagnating their growth due to stupid mistakes (spending all their money making 60 freighters).
That example addressed major races. I took a few months off from the game, came back, updated GCII and started a crippling gigantic universe game with minor races.
5 minor races started the game; 4 filled up their starport with constructors and never did another thing in the game. 4 never even moved gift ships delivered to their doorstep. The one that didn't act stupid eventually turned into an interesting diversion...even using gift troop transports to conquer other planets.
Imagine how much more fun the game would have been if all 5 minor races acted like they had a brain?