| I think there is something to the idea that sometimes a particular AI doesn't initiate properly. |
Tough / intelligent doesn't get even economic bonuses, just the full AI. Just because a race is passive though, doesn't mean its broken, it is actually a built in feature. The developers have said that each game the civs will have their aggression randomly determined. It could have been a combination of getting a bum start in the colonization phase and a low aggression factor for that game. Supposedly it's there so that you never know exactly what to expect from the AI's, making them less predictable. I've had the Terrans after my head in the first year once even though I was a good race, which definately took me by surprise. I think my jaw actually hit the floor when I got the war declaration out of the blue when I was making plans to ally with them.
I also find that in the higher difficulties, the Drengin and really most military minded races do better. I guess with incredible economies (and any unmentioned bonuses on the really high levels) to support their military, it becomes a much more powerful strategy. In my last game the Drengin declared war on 4 civs, one right after another, and wasn't too far from winning them. Their ships were very powerful, and they used missiles and armor when everyone but me used mass drivers and armor. They had gotten almost all the soldiering techs and the first to get orbital fleet defense so conquering them was a long and painful process. I couldn't have done it at that point without the Arceans tossing countless waves of ships at them divert their attention and weakening their defenses. Sometimes I followed Arcean Troops for invasions if I knew would fail even with a mass driver attack so that I didn't have to kill off so many of my people. The Drath and the Iconians were of minimal use in that conflict, but I guess every bit did help.