Hinata has
Helped Naruto against Neji
Against pain
Against obito
Save his life from pain
from juubi's spikes
Her and ino saved Kakashi , gai, bee and Naruto
Helped track down itachi and sasuke during the itachi pursuit arc
Identified what happened to obito
Fought zetsus for a full 24 day
Protected neji from attacks
Took down a juubi clone
All Karin does is heal sasuke, as far as I know.
Oh wait, there's Tsunade as well, but I think that's it.... And she destroyed statue.
That's it.
Other than that, her only use is to provide jokes along with suigetsu