We actually have a "Fleet" specialization that we want to add to the game in the future. It's got some cool abilities, but for the time being we left it out. That and the Diplomat Specialty.. but that's a secret.. sshhhh....
I think aliens are about 1500 Super Dreads, and 400 fighters or something like that.. Takes 2-3 players working as a group to take em down.. You need to beat them first shot though.. because once they get a taste of your pathetic ships they'll hunt you down like the Borg in ST:NG. Maybe that was a secret to... Nothing to see here.. move along...