Oh, well, as far as I can judge, the problem is that Sakura underestimated Naruto by imagining he would drop the chase simply by receiving a confession from her. She was surely thinking what's best for the village and Naruto himself from an objective point of view. She had convinced herself Sasuke is a lost cause. However, this sort of thing can't work unless Naruto agrees on all the points as well, and anybody could have told Sakura he will not - if only she had revealed her foolish plan to anybody. So, the sole culprit of this fiasco was Sakura alone, and nothing but ill feelings came out of it, resulting in both of them only getting hurt. All in all I think the hate her actions (and herself) thus received are not unfounded.