It would suck if all he did during the timeskip was learn to draw out more red chakra, because that would be useless against Sasuke, Itachi and Tobi. While his trump card is either too dangerous to handle, or completely useless, his primary fighting style has absolutely no significant change; especially compared to Sasuke and Sakura's colossal improvement.
If you think about it, throughout all of part 2, he just uses the same tactic he always used: make a bunch of clones and barrage his opponent. The anime shows that this strategy is just as pathetic as ever, since Kakashi, Kabuto, or any one opponent can still beat up a large number of Naruto clones. And if Naruto did improve significantly, this strategy should have been much more effective. Who knows if Naruto is strong enough to defeat any jounin.
It would be nice if he at least had super speed, or learned a batch of summon style techniques.