As someone already said, it's likely that you'll get a lot of drama in the lower brackets of battlegrounds.. I did a few WSG's at lvl 18-19, and even though I had fun scaring the horde that came into the alliance base, not expecting 5x curses to hit them where it hurt, some of the members in my groups didn't appreciate what I brought to the team.
I also tried a couple of WSG's in the 20-29 bracket, at lvl 24, and ended up as mush under the feet of some tauren dude that didn't like me at all.. (Just wait till I hit 29.. )

I guess it depends a lot on who you meet and who you go in with.. Meeting a premade as a multiboxer sucks, as they will most likely just aim for your lead, take it out, and while you change stuff around to control the group from a different window, they'll be done hammering on them as well..