2.X Mail healing gear on hunters(there was +healing and +spell dmg back then).
Completely unkillable pets with +mend pet (400% max HP of the pet every tick).The hunter itself does low dmg but...what does it matter if you can survive forever?.World "Bosses"(Fel reaver,the outdoor dragons,Kazzak...) were the first preys and the only reason we didnt see tanking pets on raids were not enough threat generation not survivability.