"...as everyone bitches and moans about a game we can't stop playing."
This.
Definitely one of those games that on the face of it, you're absolutely obliged to hate, yet can't stop playing at all. I don't know if it's the difficulty curve, or the complete lack of filler, or the throwbacks to early co-op Quake, but this game is a ridiculous amount of fun to play. Worst of all, when Activision start shovelling DLC cut from the main game at us, I just know I'll be snapping it up the moment it releases. It's like every bad precedent that Blizzard and WoW ever set, all over again. And I just don't care ;)
Definitely the best MMO-RPG-FPS-CCG -blam!-up that I've ever played. No, wait. The only MMO-RPG-FPS-CCG -blam!-up that I've ever played :D
And I. Just. Can't. Stop. Playing :D
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+1 Although I [i]can[/i] stop playing. I stopped for a few days and played some Splinter Cell games.