Let me say this...you asked for this. This is not character bashing, but the answer to your questions.
1. She is so annoying. What is her deal? Sasuke tried killing her and would have if it wasn't for Kakashi and Naruto, and she goes back to Sasuke. She is worse than Kirin. Sakura is like a dog someone kicks and the dog just comes back to the owner.
2. She does nothing. She is still as useless as before. Now she just has a summon.
3. Her greatest move in part 1 was "Hair Cut." She draws a Kunai, and attacks herself? Why not just stab a ho?
4. She was supposed to be pretty good in genjutsu, and have we even seen her use one genjutsu? She suddenly changed into a Taijutsu user.
5. I guess the over-all annoying image stuck with us. All that wasted screen time....should have been used on Genma or Tobirama. Waste of a character.