I remember seeing something about this on the boards before, but I can't find it now:
Insane pirate ships. Not just pirate ships with the most advanced weapons, but pirates ships with more equipment than is possible, in fleets with more ships than is possible. I was playing in a gigantic galaxy on cakewalk with the Terrans (I wanted to actually try researching everything, and I did). I saw a fleet of pirate ships with overf 7000 hps, 36 ships (at least 12 of them were huge, probably more), and all of their weapons and defenses were in the 100s, some maybe over 1000, except for Point Defense. I tried building a fleet of tiny ships with black hole guns, 17 ships in all, a combined attack of like 650 missile, and I think they took out maybe three of them. Like I said, I had everything, including Hyperion Logistic and Miniaturization, but my forces were miniscule compared to theirs.
I wouldn't mind strong, annoying pirates, but they should be limited to logistics and miniaturizations by their " tech level " only, with no racial bonuses. It would also be nice if they were more spread out. And if they moved of their own volition, not just attacking things they can see, but seeking out trade routes and such.