Predictably, Naruto turns out to have inherited all his abilities from his parents, and then improved on them only because he was possessed by the ancient spirit of one of the most powerful beings in existence. And even before that, when the story required him to be the underdog hero, he tended to overcome obstacles using the Kyuubi.

All of the Narutoverse in general is about magic powers (chakra, whatever) passing on from parents to children without much of a change. There's exactly one character in all of Narutoverse who's called out for being powerful due to training, and it isn't Naruto. (A few others are powerful due to research, which is of course always evil.)

Naruto is the opposite of Tsuioku Naritai. It's the story of "everyone had something to protect and practiced like mad, but none of it made a huge difference and most everyone would have been about as powerful anyway." Naruto climbs trees (metaphorically speaking) for many chapters, but keeps being the underdog. Then he starts manifesting powers that make him the most powerful individual in the universe - because he's a shonen hero - and which are entirely due to his parents and outside intervention.