She was described as being in ino's shadow according to her own words.She gets out of her shadow only to plop in tsunades shadow.
Why do i say this ? Because at best sakura can aspire to be a watered down luke warm tsunade clone.Even with her chakra enhanced strength tsunade still has more raw strength and the gap is only widened when she also uses her chakra to enhance her strength once again this is not my opinion this has been directly pointed out in the manga.She has failed to take anything tsuande taught her and put her own unique spin on it or even have a justu to call her own.Hinata tried to rescue naruto twice both times the opponent was a major antagonist and sakura is regulated to the sidelines(Can't even be bothered to do standard heroine acts leaving it up to the supporting character to fill her roll)She is a main character with litter panel time in the major and most important arc.
She healed kankuro and punched a few zetsu that is the list of her accomplishments.For a main character that is pretty bad,you know when your status reads major character lol And because of being sidelined she has not added anything to the plot.If she was suddenly erased from the manga not a thing would change except kankuro being dead and since he has not done anything major since he was healed you can't say his death would of impacted the story.I don't hater her i am just pointing out facts.
You can like her but that also doesn't change the facts.