While Hinata is a good character that didn't suit Naruto, Sakura is a bad character that did suit Naruto.

A first glimpse of Sakura suggests confidence, no nonsense personality and very hot tempted to the point where you would bill her as the physical one amongst team 7, but it didn't go so well.
Her chuunin exam was an absolute joke, she couldn't handle the sound trio, her fight against Ino was little more than a school yard cat fight, she did nothing to help retrieve Sasuke and had way too much screen time in the fillers.
It took until 2005 when Shippuden began officially in the manga for Sakura to live up to her design, that's five and a half years of stories, even beyond that she wasn't immune to her old mistakes still not being able to handle confronting Sasuke.
Sakura's daughter Sarada is a better Sakura than Sakura!
Criticism of Sakura's uselessness is justified especially when her position was meant to put her on the same level as Naruto and Sasuke but only once in the whole series run did they all fight on equal billing and that was near the end of the series.