I find it much more interesting, intead of becoming "The savior of Mankind" like all you nord nuts wanted, you become a "shadowed and perverted" form of your original self, and become a "destroyer", following in the foot steps of Alduin and Miraak before you. A massive amount of "Not so different" themes running around.
Well aren't you just sunny.
You're one of those "Being the good guy is so boring" types, aren't you?