One of my pet peves in GC2 was being harrased by AIs who think I'm weak. I don't know if tech is taken into account or not, but I think it must not be, because every game I play, I find myself in a situation early on where I have very few ships, but superior tech in them.... such that an enemy that thinks I'm weak would lose against me despite their 10-1 numerical advantage.
Sometimes I start out building a bunch of fighters early so i get left alone, but these ships are always worthless later. Once i get medium hull, fighters are dead to me.
There are times I'll build up my ecconomics, and want to placate enemies with cash until I'm ready to dominate... but I don't want to do this every time.
Long story short, I am hoping enemy civs are a bit more intelligent in determining my threat level.