sakura is the stronger of her generation, but not the stronger kunoichi of all times. Tsunade, Chiyo, Kushina, and probably Konan and Mei are stronger than her. - Not sure about Konan and Mei, honestly - maybe they are stronger than Sakura, or maybe they are on the same level, i dunno.
All kunoichis of the current generation are mediocre, and Sakura out of nothing became a decent ninja. Other than that, she has brute force, but she's too dumb to make use of that. Hinata and Ino had potential, they are elite but not of sakura level. Not sure what went "wrong" with them.
I hope Sarada became the stronger of all, she has potential to became badass. The same a say for Chouji's daughter, forget her name.