So the UEF has no advantages aside from having Alpha One on their side? Not that that matters really since Alpha One is on their side.
Of course the UEF has some advantages. UEF fighter pilots are supposed to be really good (judging from the WiH website) and their fighters look potent. They're fighting on their home turf and they have the moral high ground, as well as a powerful and (probably) well-liked government.
The tactical disadvantage of inferior weapons systems and inferior numbers is not everything.
Blue Planet is, I think, first and foremost a story. The UEF is clearly the underdog here, and that keeps the story interesting. It wouldn't be much fun if the GTVA suddenly became a group of incompetent, tactically inept jokes -- they have to be menacing and skilled, just as they were when Sam was part of their ranks.
It's not a simple war story. The UEF probably won't be scoring victories on the strength of more uberness. There'll probably be intrigue, deception, and a great deal of tactical innovation on both sides. The Vasudans will (I'm guessing) come into play somehow.
Heheh, and if you think having Alpha One is an advantage, try playing on Insane. The only amazing thing Alpha One has is the 'replay mission' button.
Oh, and I forgot to say: the UEF has the advantage of being awesome. Their ships and weapons are
sweet. And the fact that they have weaknesses just makes them more interesting.
I really can't wait for WiH.