Having seen Ebola's boomkins in action, even at 65 they were destroying mobs left and right; usually oneshotting them with quintuple-starfires, destroying alliance in pvp with moonfirex5 then giving new meaning to the term "Wrath SPAM" Let alone his "Forest of Death", 15 treants

Being a Boomkin myself in 1125+ spelldmg gear from raiding + badge gear, I know we're capable of a fuckton of dmg if left alone and can tank while still putting out good dps if not left alone. Multiply that by 5 and you've got a force to be reckoned with in pvp and pve alike ;p