Surprisingly good for a live action adaption. It's enjoyable to see One Piece from a different perspective, and seeing more character developments like Koby and Helmeppo etc.
Ideally we should see more stretching from Luffy though, his stretching seems delayed slightly in combat scenes.
If a second season is to happen, more interesting characters will appear with devil fruit powers.
Keep it hour long episodes.
Get a bigger budget for CGI etc.