The issue is that when One Piece's quality is bad it's the lowest of the low, and it's partly because Toei likes to work on so many different shows at once even after they lost most of their talented key animators. So they swap what they have left around constantly.
there most talented key animtors(katsumi ishizuka,ryo onishi,shida,yuki,takashino,shimanuka,hisada,urta,shintani,takeo ide) all still work at toei, even the there top 80s and 90s key animators.
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Good for you but not others
No the animation and art has drop in since water seven and gone downhill even more since then.
Just watch some of the early ep before then everyone notice this .
The over all quality since the early days have gone down a lot.
all the later arcs have better animation then water seven especially the ones right after it like Thiller bark,soa bondy,amazon lilly,impel down and marine ford.
Gear 2 was done well but like i said things have gotten worst since then .
For eg the they now adding a whole bunch of nonsense to the fights to draw them out .
Just look at all the extra trash they add to gear 4 fight as a eg and there is many more eg of this.
In the manga don was getting his ass kick luffy was in total control .
Now instead in the anime it looks like a even fight with amount of stuff they add.
Not to mention how far they made python stretch lol
I have some news to break to you, nearly all your favorite anime fights from an adapations have extra stuff added in, an adapations rarely follows the fights panel for panel (if they didn't they would all be over in about 10 panels ), they wouldn't be much of a fight at all if they didn't take advantage of the moving visual medium.
The music is boring now to me .
The music we hear during the gear 4 fight is what we hear since the start of the anime .
Talk about being cheap .
the gear 4th transformation music was new music never used before, nearly every other episode in dress rosa has introduce new music that's never been used before, hell toei has released entire album of tracks they haven't even used yet that was produce for the show.