Yeah, the game is freaking awesome but I can't get by the blue guys either. Is there an end to the game or what? What I hate is that when I kill enemy ships, I always destroy their lasers in the process. So I never have enough lasers to hang with the big boys.
edit: Alright, I got up to the rainbow guys with wireframe girders. They're freaking hard. Basically, you just need to accumulate lasers and boosters, and set your girders up in one giant broadside laser configuration. Always flank laser fire otherwise your lasers will be toast and you'll be dead soon after. And don't try and go blow-for-blow with the rainbow wireframes. I had white India girders and lasers, and the Juliets still blew me to hell.