I play fairly aggressively so I may be instigating the AI to react similarly. Maybe a more peaceful player will not see much action? Anyone?
I'm definitely more of a peaceful player, and I'd say a lot depends on the race in question.
The more aggressive/xenophobic factions are generally pretty...active (as you'd already noticed with the Klurgu), including the Xpectrada and Linkin. However, even "middle of the road" races such as the Qa-Qa and AROM won't hesitate to come after me if they feel that strategic circumstances warrant it, and/or I've left myself vulnerable somewhere. They may not be as "vigorous" in prosecuting a military campaign against me, but they still seem to be pretty good at exploiting any weaknesses on my part.
Of course, I've played the game long enough to be pretty careful about that sort of thing, which means the AI doesn't attack as often, which in turn can make the AI seem more passive than it actually is. So I don't think it's so much that the AI isn't "warlike" enough, it's that it's generally smart enough to know it shouldn't attack me in the first place (which quite frankly, I really enjoy in a strategy game)!
So yes, that means a lot of my games do tend to be rather peaceful, but honestly I don't mind. I consider that to be the price for the computer opponents in Armada being, if not brilliant per se, then at least competent (generally speaking)...and I'm really very much okay with that. As with many things, though, you mileage may vary.
Again, only 100 turns in, but the AI is no more aggressive and still offers deals that are bad for them and good for me. I'm hoping they will turn and back-stab me to wake me up. I am enjoying the game, but it's no Distant Worlds, obviously.
FWIW, Neutron (over on the game's official forums) has said that often times an AI player will deliberately give you favorable deals if it thinks it needs something badly enough (cash, a certain tech, a certain colony, etc.), so that right there could very well explain a lot of it.
That being said, I do feel that the AI values map information and small, undeveloped/underdeveloped colonies too much, which can indeed to be used to exploit them in any trade/swap deal. I subsequently try not to use this exploit too often, but I'll admit it's hard sometimes!
"Evil is easy, and has infinite forms." -- Pascal