User blog comment:Kaido King of the Beasts/The Potholes of One Piece/@comment-3986064-20140822191415

I loved the Fishman Island arc, one of my favorites. We don't even know how much relevance it will hold in the future. Plus the fact that you get a grit of what the world of One Piece is like, compared to other mangas. It really shows us a concrete image of a race from the fictional world that Oda created. How could you call that a pothole?

Every arc you mentioned helps construct certain key points in the story or helps foreshadowing, it sends a few messages that can be very constructive and finally it adds to the image of whole of One Piece, which is not a monoliniar story manga, but one that stretches both in length and width, covering a large surface.

I'm really surprised you didn't mention Punk Hazard, since it was incredibly long, had no great villain and I believe you would consider it a pothole if you took into consideration those two factors I just mentioned and a few more that I can't just put my finger on.