Hi.
Onyxia HC Dungeons are way harder than raids.. mobs hit too hard and really hard to find a tank cuz noone wants to tank hcs.. only geared people tanking and many of them selling tank services. we wait like 1-2 hours to get rdf hc tank.. and at first wipe all gone.. we start again. Please lower damage of mobs in HC dungeons. or give us buffs... this is unplayable atm.
The dungeons already are in their nerfed form. It isn't unplayable by any means, people are all the time completing them, it just requires a lot more knowledge, organization and patience to complete. If you try to run them like later expansions, chances are you will fail, yes.