1. Temari. Her wind techniques sound so awesome until she actually performs them, when it's just her waving a fan around, to be honest. :|
2. Sakura. From an arm-flailing, pink-haired "Sasukeeeee~!

" fangirl, she became an arm-flailing, pink-haired "Sasukeeeee~!

" fangirl who can actually knock someone out cold, and more importantly, save a life... maybe. But she's improved.
The others have either always been of an average-level, or have not improved. Or in some cases, they have no scope for improvement because they're that perfect. 8D