i really dont know whats up with naruto... its really wierd he learned a high level jounins jutsu in a night and it was a from of bunshin which was his worst skill and then he learned the rasengan in a week which took 4th hokage 3 years(yes he learned it from Jiraiya, 4th did not create it.) but then again naruto trains quite alot at home and that tree climbing he did when hinata stalks him is put int the anime to fill time i think i dont remember it in the manga. as for neji he trained less than naruto before he lost to naruto and way more after the loss. sasuke doesnt train at all or it seems that way.

i would say naruto is a hard working genius....