I feel like Naruto's physical, strategical and contextual high and low points have already been well commented upon. So I'm just going to say what I thought was either ballin' or not-so-hot. Nevertheless, I'd give him a 7.5/10 on his performance.
What I liked:
-His entrance: appearing after the massive shinra tensei with an entire posse of huge summons.
-Demolishing robot Pein in the blink of an eye. http://www.onemanga.com/Naruto/430/17-18/
-He held his cool after seeing Konoha decimated and after finding out Kakashi's grim status.
-The way he stood fearless against the rhino summon, stopped it dead in its tracks and launched it into the air. http://www.onemanga.com/Naruto/431/04/
-The multitude of new attack moves/variations that we saw out of him.
-His strong emotional attachment to Hinata's sacrifice .
What was not so great:
-When Pein had him pinned down to the floor via his chakra rods.
-Giving himself into the fox's will. I keep wanting to say the fox's "engaños," any Spanish-speakers might appreciate that.
-That he didn't kill Nagato right away. (Although I understand that it is important "plot-wise" to keep him alive.