I was playing in a tiny galaxy in suicidal mode (just messing around) as the Yor. I was obviously lagging behind in military and tech but doing OK in economics when all three other civs declared war (Altarians, Humans and Torian). All right, I thought, they all hate the "evil" Yor. But wait, they all started the war at the same time without having any relations beside trade? hmmm...
So I started a new game (same setting: Tiny, Suicidal) as a custom, neutral race, put all civs having close relations to me and by the same time (turn 30-40) they all got hostile to me because my military was weak and all three races (same ones) declared war again, Altarians and Torians in the same turn, Terrans some turns later. This time saying they wanted my planets. Started another game, same thing. And it happened again in another game.
Why is the AI always making the same decisions at roughly the same time? If the Altarians are supposed to be good why they are acting just like the Drengin? It seems that the ethics alignment doesn't apply to the AI. And the fact that they made the same decision at the same time is worrying. Notice that the 3 civs weren't in a alliance.
Looking at this problem I guess that it is not possible to make a good mod of Star Trek, as an example, if the Federation starts acting like the Borg, assimilating every weaker civ out there. So I sugest as a future update to put an agressiveness slider in the AI to make possible to have more variety in the AI behavior. They all are by now just as bloodthirsty as each other and they're unable to keep character because they all act in the same greedy way. In MOO2 I never saw the alkari, silicoids and psilons getting out of character. The game is great IMO but this aspect can get much better.