I grant you, they have elements of co-op play, but they aren’t designed with co-op as their primary focus. Yes, you can group-up in order to take out that Elite over in Thundercrack Woods who’s head is worth a lofty sum to Sergeant Boff of The Crinkle Creek Watch, or you could join a raid party in your never-ending quest for the latest tier-set. The thing is that these interactions are not the bread and butter of the game. The thing that keeps people coming back is the accumulation of the latest stuff. You’re always chasing that last piece to complete the set, or the last few points of XP you need to *DING MUTHA*@*#ERS*.

L4D is simply a shining example of co-op play. Other examples include the afore-mentioned Gears of War, Diablo II, Descent Free Space, Neverwinter Nights 1 and 2… The list goes on.

My primary point is that co-op games are great and that there need to be more of them produced with the same care and consideration that has gone into L4D.

Maybe your post is less about the availability of co-op games, and more about just telling everyone how much you love Left 4 Dead? ;)