Shamans aren't overpowered. They would be if totems were mobile or unattackable.

Elemental-good at range combat, but have trouble with few mages, fury+arms warriors,rogues, cat druid,BM and Mark hunters,and enhance shamans(some know how to kill em)

Enhance-good at close combat and do great damage with windfury, but have trouble with ret pallys(pretty much balanced), few mages(not fire), hunters, arms+fury warriors, disi priest(the mana burn), sub rogues, demo warlocks

Resto-good at healing(obvious),cast ok and able to stay alive good, but have trouble with mages, rogues, hunters, som warriors, som warlocks, disi priest (the mana burn)

Overpowered, i think not. Im not really dissin shamans, i got one of my own, Hydralicz lv70 enhance shaman. They r a good class, only if u know how to play em. To me, the only classes that seems overpowered are Arcane mages with pyroblast and Ice mages wit counterspell-silence. Those r the only classes that poses a big threat to all other classes