I agree, One Piece fights are meh
there's great hype moments of fights, like final moves or new modes, but not entire fights
however
JJK, even during this insane fan service battle that was built up from chapter 1, couldn't reach One Piece levels
and JJK already ending in 8~10 months, while One Piece still going strong, so yeah
in fact, many people say Egghead is top 5 arcs in the entire story
while many fans say JJK's last few arcs have been really bad