I think that's one of the underlying themes in Kishimoto's manga.

1) Love and friendship, fighting for precious people.
2) Hard work can beat inherited talent.
3) The underdog coming good.
4) People overcoming prejudices to make a name for themselves.
The whole sweat vs Sharingan thing is supposed to highlight the difference between sheer effort and talent.
Mark my words, Naruto is going to be a hell of a ninja in the end. He'll probably even surpass the Fourth because he's working so hard and he cares so much about others.