Actually, the long-term appeal of Borderlands is one part of the game I worry about. It's an awesome game at first (I've been playing it almost as much as I can since the day I bought it), but I'm not sure it has the kind of replayability games like TF2 (or L4D or CoD or whatever) have. I can imagine that as soon as I have completed the game, did all the sidequests, found some kickass unique guns, reached level 50 with my main character and a high level with the three others, there'll be not so much reason to keep playing anymore. Sure, it's a great coop experience, but I just think fighting the same kinds of enemies over and over again will get boring eventually. Not anytime soon, mind you, I'm quite sure I'll still be playing Borderlands enthusiastically a month from now. But three months from now? Unlikely.