Many. Luffy, hasnt even developed proper wisdom of how a strong MC is supposed to be. Author's treatment is also way too fluctuative and inconsistent, humiliating his character or powerlevel at one moment and put him on a pedestal at the next. Zoro, way too cool-badass-oriented and bleach-like. Chopper, great various forms but too full of cute gimmick.
I still like them but not as much as--
"NAMI! YOU ARE MY NAKAMA!"
or
"go ahead and take the head...BUT JUST TAKE MY HEAD INSTEAD OF HIS! I WILL BECOME WSS, I'D SAY MY HEAD IS ALSO A GOOD DEAL!"
-- Those kind of mighty goosebumps-inducing dearest of characters.