Annoying cutscenes, lousy plot devices, and death upon death upon death, even at the newbie level, I sent this one back early. Linear gameplay with no way to climb except where the game demands it, camera angles that swing around at the drop of a hat, and a total lack of ammunition drops made this game tedious at best. Poor use of cinematics, and checkpoints in areas where you couldn't even get up to go to the fridge.
All the scenery was in shades of grey and black, and things that look like they should be usable are not. Stupid skill point usage, and boring story.
The co-op did work seamlessly, but the actual co-op feel was only useful when opening doors.
Giving it a 2 for the fact that it did run without choppyness, and the co-op worked.
This game is amazing on many different levels. Quick overview: four different stories, online co-op, intersecting story lines that intersect with other players online, awesome weapons, interesting bad guys, suspenseful, graphically superb, and did I mention how fun this game is? Seriously, there is so much to this game you can play it for ever and never feel like you've repeated anything. Definitely rent this game.