I believe when fully buffed to the max, all dps classes/specs should be equal and it being up to the skill of the players to determine dps ranks in the raid (assuming equal gear). Not matter what buffs they bring to the table. This has been the excuse for high rogue dps, that they bring no buffs so they were given high dps, which just makes them hated. But blizz is working on the "invite them for the player, not for the class" motto.

They are trying, so I'll forgive them. I'm sure it's not easy to try to balance everyone.