I've been playing the shit out of this game for about a week... it's really fun. The campaign isn't really all that long, and it's not TOO hard to beat, even on the highest difficulty level, but it's still a blast to play.
If you don't know about it-- it's a third person shooter where you go through six missions. Some based on real life happenings (Somalia in 1994, Afghanistan and Iraq right after 9/11); some based on fictional happenings in the future (Miami after it's been destroyed by a hurricane in 2009). You and your parter are part of a private military going through and completing objectives and such. It's not really a run-and-gun type game though... you have to actually use a bit of strategy or else you're gonna die pretty quickly.
I like it a lot. If you have a 360 or PS3, I'd suggest at least giving this one a rental.