Wow a lot of anger in this thread.
I am enjoying the game quite a bit, after I turned my TV to game mode the input lag decreased considerably (yes I'm playing on a PS3, I enjoy shooters from a recliner) I had thought it was broken, but I always forget about the damn TV settings. I'm happy with my load out and weapon drops at this point but I'm only level 17 so nowhere near endgame.
I can't wrap my head around co-op. It seems like it would only be fun in a LAN setting, which would explain some reviews I've seen. I generate much less cash and weapons in public games. I've seen massive amounts of hoovering where items disappear after I thought I had picked them up, I'm guessing from lag. Everyone in a mad dash towards the story mission, or they stand around doing nothing.
The story is terribly hard to follow since most events happen off screen because I just happen to be in the wrong place, or they already know where to go. So I stopped playing multiplayer.
Other than that pretty decent game.