User blog comment:Granit Hysaj/New Devil Fruit Users/@comment-67.87.5.224-20110731043015

Oda specifically said that he wants Usopp to remain humanish, he states and I am paraphrasing, that Usopp will always be the weakest in the group, and have almost all Human strength qualities, except we know he is a beast marksman when needed.

I think nami just needs more moves other wise she is good as any of them if she fights correctly. Usopp needs to just be tougher like brave, hes a marksman, and lets be real the blackbears marksman (forgot name :P) was able to shoot a target from many miles away forgot what episode, (if you remember then help me out haha) anyways, he just needs to get stronger mentally, and a bit in actual strength otherwise he is fine.