It is possible, with a good healer, for a level 74 Ret Pally in herloom gear and a smattering of greens and blues to tank the mushroom trash, the faceless ones, and the last boss in Old Kingdom.
So if you're tanking Old Kingdom, and 3/5s of the group asks you to go kill the mushroom trash before killing the boss, don't be an arse, because you might get kicked, and they might just not need to wait for another tank from the queue.
That is all. Move along, citizens.
WoW Insider – the Omega and the Alpha
6 hours ago