Neji becoming useless after being beaten by Naruto.
Gaara turning from a monster that could pwn Kakashi into a... well he's not that strong compared to part 1.
Sakura being the only one in Team 7 to not surpass her master. Naruto is so much ahead of Jiraiya, Sasuke arguably beats Oro, but Sakura is so weak.
Also Sakura still loving Sasuke after he tried to kill her and Naruto still trying to save Sasuke after he put him through so much pain and tried to kill the woman he loves.