Although there was a lot of drooling when rated BGs were coming out by multiboxers who were used to joining pugs and smashing in faces of your run-of-the-mill BG participants, it didn't work out like that in rateds. There are tactics that make multiboxing unfeasible in the vast majority of BGs where a solitary rogue can screw with your 4-5-10 guys to the point where you're all spread out or you're just sitting there.