Just finished Episode 1 of DV. The game is really slow to ramp up. The last mission in the episode is the the same as the demo but WAY better, you're knocking out shield generators and then doing vertical combat up into the reactor core, blowing it up, then freefalling out of it as everything explodes. Feels pretty awesome, I have no idea why the demo didn't include any of the cool stuff that's in the actual game.
I am a sucker for any game with freefalling and shooting stuff from the air, though (see Just Cause)