The greatest actors to me are those who can be equally convincing playing a villain or a hero. That sort of versatility requires a reservoir of talent much deeper than that necessary to be just a "good guy" or "bad guy." And the same is true with professional wrestling, in my opinion. Some guys spent their entire career being heroes (like Ricky the Dragon Steamboat) or villains (like the Sheik, or the Iron Sheik). All of these wrestlers were very talented, and knew how to tell a story, but the lack of multi-dimensionality is a major negative for me.