This came out a couple months back but I just got around to playing it. Pretty cool, even better than the first one. They fixed some of the annoying aspects of the first game and added some gameplay elements to spice things up, like reload bonus/penalty and choosing paths. Otherwise it's a continuation of the first game, which is cool if you liked it, but not so cool if you're against sequels that are basically add-ons.
Weird thing is, I played in an my X360 at home on hardcore difficulty and I had to redo most levels 3 or 4 times to get past. Now I'm playing on hardcore on my friend's loaner X360 and I'm breezing through levels. I still have to repeat a few of the harder levels (boss levels), but it's just altogether easier. Not sure what to make of it.
Game score: A