Everybody but, Luffy, Roger, Big Mom and Oden are pathetic in One Piece.
Luffy like Oden and Big Mom never trained his physical strength( until Wano) and just worked on mastering their devil fruit, or Swordsmanhsip and haki. All 3 of them just relied on their natural strength to carry them through.
Luffy does not even have a fighting style. The man is in a constant nerfed state due to not even having a fighting style.
Luffy is even self taught, while Zoro and Sanji had actual professional masters as well as training.
Zoro's case is even more sad considering that he was taught by 2 Master Swordsman, and Haki concepts as kid in additon to constant training but still ends up being weaker than 4 Worst Generation Members.
Sanji is a prodigy as well though, being this strong without proper training during the 2 year timeskip.