Re: Sakura = Kushina
-Sakura and Kushina both have short tempers and aren't afraid to hit others. They both hit Naruto almost immediately after not seeing him for a long time.
-They both were made fun of for a physical trait they hated when they were younger. Sakura = her forehead, Kushina = her red hair.
-Both have only ever had one man compliment the thing they hate about themselves: Naruto and Minato, respectively.
-Sakura looked down on Naruto and thought he was annoying. Similarly, Kushina looked down on Minato and thought he was a flake. Only when they were older did they acknowledge the boys.
-A little more on the physical side rather than personality: Both have been praised for their appearance.
-Again, physically: their hair colour is similar. Kushina has red hair, while Sakura has pink hair, a branch of red.
There's more, but I don't feel like posting them. I could also post similar panels between them, but.. Nah. If you think Kushina and Sakura are nothing alike, you are in some serious denial.
Also.. Sakura isn't useless. She was in part one, yes, but certainly not anymore. She is a powerful medic nin. Sure she isn't amazing at battle (as some might say) but she's not supposed to be. Medical support for the team is her first priority.