The "level of intelligence" should only be a problem to you if you are not managing to accomplish what you want to accomplish.
If you want to accomplish could fusion youd probably be worrying about not being a genius. If you want to make a comic book, you should be drawing. If you want to impress others with your intelligence, you should suicide.
Your "intelligence" should be a consequence of your intentions. To me "natural geniuses" are the ones who grabbed to a hobby since a kid, so they develop theyr entire live around a subject, making them super experienced on it.
So a super brain would be one that allow for fast learning and good keeping of information, like savants.
I do wander how much % a super skilled person is effortful and how much % she is fast learner. To me it all ends on how much different persons need to study to get the same level of skill.
Consider Carmack, does he have a super brain? If you read the book Masters of Doom you will see that all he cared about in live was programming. The bastard even dumped his cat cause it was too much nuisance for him. If someone has as much hours of programming as Carmack, would he be as skilled?