Just went through this fully for the first time, seeing as the interface bug I had seems to have solved itself.
Overall: I loved the campaign and especially its music. I know I heard Sword of the Stars (The Moriggi battle track and a few others I believe) and maybe something from Universe at War?
My only qualms that I had were the lack of shielding on the Ancient ships and their very slim advantage over the Asdherians' ships. First of all, I like the fact that there were no shields, it makes dogfights that much more interesting, but it took the GTA what, a few months to reverse-engineer shield technology from the Shivans? Second, the Ancients, for all of their superior technology, always seem to win by a slim margin in small-ship combat.
I hope I don't sound overly critical, as I loved the campaign and my gripes are pretty minor and only with the story. I'll leave you with my closing question: Can I haz Act 2?

EDIT: Damn you automated back-up