The thing is, Kishimoto made EVERYTHING he could to make the readers HATE sakura in the first part. She was useless, whiny, fangirling and a typical type A Tsundere. He tried to redeem her in part 2 but that was really too late. I mean, she's not that bad as a character, but as the "Main Girl" of the manga, she's just lame.
Of course she's useful as a Medic, but do you really think that this would redeem her? The fact is she's been WAY more of a nuisance than a help, and she gets no crap for all the time she put herself and her allies in danger.
Suddenly giving her a powerup doesn't erase 631 chapters of really poor character development, all the more when even with said powerup she proceeds to need a rescue from Sasuke and Naruto.
I don't mind her fangirling over Sasuke again, that's her "thing". Nobody here complains when Hinata is all "Naruto..." all the time. So yeah the difference is Naruto never tried to kill Hinata and all that, but really Sakura being a Sasuke Fangirl was even more expected than her using Tsunade's jutsu.