I played through the 5 campaigns in L4D2 and sent it back to gamefly. I just don't understand why everyone loves those games so much. I know theres suppose to be huge replay value cause it's never the same, but really it is. Kill zombies till you get to a safe room, I played through 3 of the campaigns 2 or 3 times and nothing seemed different at all.
Of course I've never found Co-op games too appealing, I'd much rather shoot people then work with them.