Warrior Ensham, Rogue and Paladin Damage will be through the roof if they can keep with a class that can put up snares and CC for them to take advantage of. Right now it looks like most any mage (But frost especially) or a BM Hunter would be your best bet at remaining viable on the battlegrounds... oh yay, I can finally use that word in plural ^_^. You'll have to play in a coordinated manner, about the only class that is singularly OP right now are the Frost Mages... but I'd say that they could be trumped by a BM Hunter's mass of interrupts. If you, as a warrior, were to stand right next to a BM Hunter that's Steady/Scatter/Intimidating/Ravaging a Frost Mage into a mass of mushy stuff, you take away the one thing a Mage can do about a BM Hunter, which is stand in melee with them to start casting... since something that is even more painful is standing right there ready to make a mess of their face. Against more mobile targets, a BM Hunter could Conc shot to snare a target, then scatter shot later to stop a target entirely so you can get into melee range while they keep a steady stream of Steady Shots rolling on the target so they can keep Concussive Shots and Intimidations going on the target to allow you to remain on the target.
Aimed Shot, while powerful, has a 2 second cast time and focus will quickly be expended on other purposes in an LoS environment like the bases. I expect that MM Hunters will be more prone to stalking the midfield than trying to fight on O or D.
What's the typical damage reduction of the various armor classes, Bearform Druids and Shaman with Shields presently?