Oh and, anyone else really, really excited about the co-op in the game?
Sure, I'm going to like the single player campaign, and the multiplayer. But we haven't had this level of co-op game except in MMOs.
I mean, on top of just normal killing enemies together with friends, you get 3 classes that have to work together in interesting ways. You also gain experience and pickup loot (boss enemies can drop Grey Tech items that give you a bunch of experience). There's also bosses that aren't found in the SP campaign. Not to mention you get masses of enemies to fight. Dynamic maps with dynamic scaling enemies.
Other games may have a similar list of features overall, but R2's co-op makes it stand out. Not Halo 3, not GoW2.