We have to differentiate.
It's certainly no literature masterpiece like some confused fans want to talk it up to.
If we compare OP to other mangas of its genre (shonen), it's still clearly better than most. There are only a handful of shonen mangas, that are better imho (HxH, SnK) while only a few newcomers are on their way there (Jujutsu Kaisen).
OP has always been a manga, that thrives on its macro-story (bigger themes, worldbuilding, interconnectivity of the arcs etc.).
The micro-storytelling has always been bang average. The pacing is mediocre at best, there are a ton of PIS moments and plot conveniences and Oda uses the same formula for each arc:
1) Arrive at a new island.
2) Split up, have an adventure and meet the local heroes (most of the time a young female amongst them).
3) Learn about the problems of said locals.
4) Meet the villains.
5) Lose their first encounter in some kind of way.
6) Flashback about the history of the island/local hero.
7) Villain threatens to destroy everything (Bomb in Alabasta, Advent Of Thunder in Skypiea, Buster Call on EL, Noah in FI, Shinokuni on PH, Birdcage on DR etc.)
8) SHs go into round two against the villains (main fights) and win, saving everyone in the process.
9) Banquet and celebration of everyone on the island.
10) Sailing to the next island.
I mean you CAN do that, but on a micro-storytelling-level it's just as unimaginative and repetitive as it gets.
Still, due to the amazing macro-story, OP is a solid to good shonen. Just not a masterpiece in terms of writing.