Dragons have been a staple to JRPGs for a long time, and Dragon types in Pokemon are no exception. That's like saying there shouldn't be Ice types because they stink despite being also a staple to JRPGs.I'm sorry, for the personal bias here, but I hate Dragon types.
I don't hold it against anybody who uses them, but you will pretty much never catch me using them.
I think Legendary Dragon pokemon are obnoxious. I want to see more Legends cover multiple types that does not include Psychic or Dragon.
So Kyurem at this point is just another stupid Dragon pokemon that I could care less about. Consider him caught and boxed.