Multiplayer, right off the bat. With this game, that doesn't cost me any story, and I want to experience the teamplay with actual human beings. No matter how good the bots are at what they do, no matter how strong they are as teammates, they're not going to develop trust, nor loyalty, nor that near-telepathy that you get about tactics when you play with the same people enough. I don't know anyone else who's getting Brink for PC, so I'm not sure how much of that last one I'm going to get to develop, but playing with humans is still much more attractive to me.