Sakura international defence force member reporting in for duty!

So... who's talking crap? :mugi:
Sakura is not a poor case.
She is similar to Kabuto.
Kabuto went quite unnoticed before he obtained Sage mode, Edo tensei and other powers by infusing it into his blood (which luckily for him is AB+). However Kabuto was pretty good already before he obtained those powers.
Even though Sakura is already pretty good and has her moments, after the Sasori battle as well, she goes quite unnoticed by many, just as was the case with Kabuto. Once she might obtain a power or multiple powers like Byakugo, Slug contract, Sage mode, Genjutsus(her talent area) than most people will notice her. But if you already take a good look right now, you will notice she improves.
When your teammates are Sasuke, Naruto and Kakashi, than it isnt weird, that you have a hard time competing, when you dont have something like Uzumaki genes, a special clan or sharingan.
Compare Sakura to the others of the Konoha age group and she is at the top or at least near it, and among them are those who are born in special clans and who could be spoonfed with jutsus and are already given a shinobi fighting style from that clan, unlike Sakura. She had to find her own path, her own style. Nobody told her to become a medic.
She is among the top medics in the war and healed many (also behind the screen). She helped in healing villagers when Pain attacked Konoha and she took out summons. She found out which fake teammate in the camp was the Zetsu(would have been a disaster if the medics were wiped out before Naruto arrived), helped with analyzing Zetsu DNA, she made sure he teammates werent wiped out by Sasuke by throwing a sleepbomb on them. I forgot some no doubt.
Its true that she hasnt been in some big 1 on 1 battle since Sasori though.