One thing people are also forgetting with this is that the campaigns teach you how to play the game.
How the crap am I supposed to learn how to use the Zerg and Protoss if I can't play their campaigns? Play against the people that have already finished and gotten good with the Terran campaign?
I guess I could just experiment around against the computer but the campaigns in games like that have just always been a great way to learn that race. Terran players will have a huge advantage until the Zerg campaign is released and then it's only going to suck to be Protoss players.