Sakura is (99% certain) thinking Sasuke saved her because he caught her from falling when the sand fell away from her and the tree. And no-one ever see's Naruto fighting. Sakura gets knocked out , Kakashi is back at the village and Sasuke wont talk about it at all because he talks the least anyway (and when he does its nothing to do with whats happening at present!). The little dog, Frogs and Sand Ninja all went back to where they came from and Naruto is still, in everybodies eyes, the same stupid Naruto as he has always been. Well , of course he has grown , through 80 episodes, I would expect so to, just that a heck of a lot of people havnt realised this until the last , say, 10 episodes ( people = people in the anime).
He's got a point, most of the time Naruto has accually done something amazing, nobody's there to see it (cept for Sasuke in the most recent battle) im taking the guess that they're all waiting for him to show his true strength sometime soon and have everyone acknowlage him there.

If you look back at it:

Haku v Naruto = Sasuke's "dead" Kakaishi only notices the seal weakening.
Oro v Naruto = He busts out some of the kyuubi but then is stopped outright, lame, but he was vs Oro.
Kagari(?) v Naruto = Stamina seems to be the only impressive thing about this fight
Kiba v Naruto = 1st time the more important see him fight, but without Kyuubi (seal) which is a advantage he has over others, just as any Advanced bloodline
Neji v Naruto = Hinata is out, but this is one 2nd time they actually see him fight, probably say this is the only real time he shows his stuff

Edit: Some of those may seem alittle one-sided.