Thread title scoffs at the notion WoW is a violent video game. Well, World of Warcraft IS a violent video game.
Case in point: Blackmoore chops off Taretha's head when he discovers she helped Thrall. And then the next time they meet, Blackmoore throws her severed head at Thrall's feet.
That's pretty violent for anything. You'd score an R rating for a movie with a scene like that.