Writing quality: There are many mistakes and some things are in such a way written, which you normaly wouldn't write that way, so it is wierd.
Story development: Cant say much about it, only read a few chapters but it was okay, not really good but not that bad either
Character design: You don't learn much about him, his childhood was skipped, could have been done much better
Update stability: Yeah idk about that so 5 stars
Wolrd background: One Piece, nothing more to say about it