What are you going to call it ? <| sep |> But you bet your ass I bought one <| sep |> Worldbuilding and powerlevels are often cited as the reason One Piece is so good . While I agree that they are strengths of the series , in my opinion , they are ancillary strengths . What makes the series great , to me , are the core themes of the series freedom , following your dreams in the face of great risk , friendship and familial ties and adventure . These themes are reflected in everything about the series the structure of constantly having new islands to explore , new threats to face , new races of people to discover , new friends to join their dream to yours . The art can get so wacky and bizarre because there are no limits to what can be discovered . The humor of the series pervades everything , and everything is fun because it is fundamentally about following childhood dreams .