I'm sorry, but this bullcrap. I hate this excuse now because I can apply to Sakura as well. As I have said many times, SAKURA IS NOT THE MAIN CHARACTER.
Are we denying her status as a main character now? She is the main female character, and she's constantly compared to Naruto and Sasuke throughout the manga. To make matters worse, there's the Sannin parallel, in which they're all supposed to surpass their masters (which Sakura did, but only displayed it much, much later. Basically my point, it happened too late).
Maybe because she hasn't charged that power fully yet?
That's a bad reason, I asked for a good one (really, not much time has passed since Pain's attack). The truth is that she had that power at her disposal the whole time, but didn't use it on live or die situations (whereas Naruto still had yet to unlock his). It's bad writing by Kishimoto, thus poor character development.
Anyway, you asked for a reason why people hate Sakura, I gave you a possible one. I myself don't hate her, I'm just not satisfied with her development. In my opinion, Kishimoto has treated her like an afterthought when he should have given her more relevant stuff to do.
Edited by Ether, 09 September 2014 - 08:47 PM.