He seems to be rather easy especially when considering how much Blizzard over exaggerated his difficulty. Frontal aoe cleave is easily avoidable and the mass aoe can be negated through personal cooldows. Spreading out makes the beam damage non existent. Killed him just a few minutes on Vashj EU with 4 full raid groups
heres the screenie
seems like his design is flawed and can be easily zerged