Again, I'm not meaning this in an insulting way, but you saying any music loved by many is "not too different, mass appeal" is like a non-chef telling Gordon Ramsay his food just doesn't quite have enough pizazz. It's ok to not like something, but I don't think you can discount it in any way unless you're an expert in the field, and I've never met an expert who discounts any of the mainstream "legends"