I didn't say anything about a full guild group, I said a full ICC 25man geared group, it's silly to consider comparing co-ordinated guild groups with pugs. We demolished POS when I went in as DPS too, had a Paladin tank and his dps was massive on both single target and especially AOE, both of us upwards of 15k on the trash, I was at 6k on bosses and he was doing like 4.5-5k... I recall we had a rogue doing ok dps and I can't remember the others.
I mean it just got demolished, not full BIS ICC guild run demolished, but random pug demolished. I did another one with a Blood DK tank and his fucking Blood Boil damage was a sight to behold, he was making my Fury dps look sad on some pulls. When I tanked them I did it as a Prot Warrior, and yes it seemed I was quite immortal thanks to Ignore Pain, damage was also very strong though not quite so strong as what that Paladin or DK did.