That's not really the point. Usually a launch trailer is designed to get people pumped about what they'll experience in the game. Given that MP is the focus of BF3, it seems rather silly to only focus on SP footage (and almost no gameplay, at that). It really doesn't make a difference in the long run, but I still think its kind of a baffling decision. I think it would have more sense to make a "Campaign" trailer earlier, then release a launch trailer showing mostly MP stuff.Perhaps you missed their dedicated MP trailer that was released just a few days ago?
But whatever, it doesn't really make a difference. I honestly see this type of launch trailer aimed at attracting the CoD crowd more than anything else, given the whole super-scripted Michael Bay-style presentation of the whole thing ... it looks just like a MW trailer, and I don't think that's by accident.