I have the same question. She WAS annoying sure, but that was all in the past. What weren't we annoying when we were kids or something? Isn't Ino annoying? Why is Ino any better than Sakura? Why is Karin any better than Sakura??? Aren't they annoying? People who say Sakura is annoying must mean they haven't seen Shippuden yet... T.T
You're completely right! She gets better. But I liked her pre-Shippuden as well, because I was probably like her at that age, and I'm sure I annoyed people too. Some people just never gave her a chance.
Mizuki. He was unnerving during his first appearance, but throwing him into the filler episodes into what would be one of the worst Naruto sub-plots ever was completely unnecessary. He was also too over-the-top for me.