Can we finally admit that One Piece...isn't that good?
It was first acquired as a tacked on requirement to another deal, Toei has tried to market it for years here with less and less success (see games going form physical releases to download only for one console). It has been released over and over to a smaller and smaller audience.
The story is ham fisted, the pacing abysmal, the characters devlolved into utter caricatures at this point, the stories lacking depth and emotional resonance, and the art style has never appealed to the West. It looks goofy and boring because it is.