What purpose does this class serve in the game? Elemental Shaman are weaker than mages, and mages can bring Blood lust now. Arcane mages can even give the group a damage buff. Warlocks give the equivalent of Totem of Wrath, and like mages, their DPS is superior. Why bring an Enhancement Shaman when they do mediocre DPS, and their buffs are covered by other classes? Resto Shaman are arguably the worst healers in the game.
If this class vanished tomorrow, I don't think most people would care, and their role would be quickly taken over by other classes. Blizzard needs to do something with this class to make them unique and worth playing, because as of right now, I see no purpose for this class other than Thrall being a major character in the franchise.