The best multiplayer co-op experience I've had in about a decade (right there with Mass Effect 3's multiplayer, for those who remember that). Takes all of the best elements from its predecessors and contemporaries alike and adds in its own sense of tactical flare and satirical goofiness for a game that is as viscerally intense as it is silly. It's a game I feel like I could have dreamt about as a kid growing up on Halo, Aliens, and Terminator.
Good job, Arrowhead.