Just finished the campaign, and wow. One of the first games in a good while that's been able to keep me engrossed all the way through, and one of the first games in a good while that's actually presented a bloody good story. Striking at a Russian strong-point in France, retrieving data from a downed B2 behind enemy lines, regrouping your forces after a nuclear detonation... it's got it all. It's also nice to see a game that presents characters that not only hold your interest, but that you actually care about what happens to them.
Really, really can't wait for an expansion and/or sequel to continue Larry Bond's finely-crafted story. If you haven't at least tried the demo, check it out. Now.