Onyxia HC Dungeons

So im pretty geared tank pally for hc dungeons,but yet it seems like its damage bugged.i started to clear 3 adds and they did 5k dmg per hit.Is it normal for hc dungeons?Even in other instances mobs deal like 2,5k per hit while i have 14k hp it doesnt seem normal for hc dungeon,even kharazhan was easyer then some hc dungeons.Which dont make sense synce dungeons give weaker items than kharazhan.

Its the same for me. I am nearly PRE-BIS Warrior Tank.

WoW TBC was really that hard. You need to Crow Control and the Damage Dealer dont need to get aggro. So its not your fault, the random people are mostly to stupid to play that old hard ****.