What was so special about this game was the degree of customization. There was a vast array of choices you made to create a character, breaking it down from most factors on the human body. This allowed people to not only create their own dynamic characters, but also copy many of the existing ones out there like Wolverine. This lead to Marvel suing City of Heroes over this, and if a company like Marvel is suing it, you it obviously points out how good it could be.