Balance is currently 9th on average (not median) for overall DPS minus Halfus on stateofdps.com.
I think the OP isnt concerned with the average DPS though, but is comparing boomkin's maximum potential DPS on any given fight to that of other classes. They DO fall far behind other classes in this regard. You only need to go to the actual WOL site and look at the overall rankings for each boss to see this. Different encounters favor different skill sets though and the upcoming patch should help to balance the classes further. I play feral and we currently rate 12th, so I dont think anyone will be telling you to reroll.