It is all Kishi's fault for making Naruto so weak to begin with; the same way he made Itachi so godlike only to be beaten by his emo brother without ever showing his real power (yes we seen glimpses of it but by the time he was ready to go all out he was almost blind, had some sickness, and was hoping for his brother to kill him).
Naruto should have never been as weak as he was just for the the fact that his father was the -the- 4th Hokage (hell even the little bit we've learned about his mom makes it seem like she was even fairly skilled), and that he had the demon fox inside him.
The problem here is Kishi's giant hard on for the Sharingan. Sasuke has a sharingan and this is basically why he's as strong as he is. Naruto has a father who was (I think) the youngest and strongest Hokage, was trained by two legends; Kakashi and Jiraiya, and has the strongest Bijuu inside him. He matches Sasuke in every way (strong father/trained by Kakashi/Sannin, some sort of special power), and Kishi meant for this, except without any real explanation Sasuke is always more skilled, and not by a little but by leaps and bounds. Naruto should be at his current power level but it should have happened gradually since (and during) the time skip.