I would have no qualms to recommend it to people who don't know One Piece.
Those kind of people could rate it at like 7-8/10 if it hits their interest, Regular One Piece Fans I assume would rate it a bit higher 8-9/10, Fans who know every detail would probably rate it more like 6-7/10.
The base is strong and enjoyable. My local dub was quite amazing, but without the original audio though I cannot really judge the acting. If I have the time I'll rewatch it with the original voices and the JP dub too.
I feel the general tone is a bit too realistic though. Due to this some emotional peaks didn't match the narrative peaks. Some crying scenes could be a bit more over the top, some fighting scenes could be more fluent and have a better climax.
Fans who know the story inside-out will question quite a few things though.
At least I felt bothered at time.