From an aesthetic perspective the movie is basically flawless. The animation is gorgeous, the character designs are on point, and every costume change the case goes through is exciting and memorable. The film-exclusive character is far more memorable than most of her predecessors as she is an old girlfri- I mean accomplice of Nami's from her cat burglar days, and their dynamic is simple but effective. Getting the One Piece cast to do a heist film is inherently interesting given how batshit insane the characters are, and the genre-standard twists are handled well. There is a particular sub-twist that makes perfect sense in universe that was both inspired and hilarious.
The movie isn't flawless character wise. Like most OP movies the characterization is slightly off. Nami, despite having ample screen time, never comments on the fact that the kids enslaved by the casino are basically in the same situation she was in for a decade. Luffy seems unusually apathetic when a crewmate is placed in danger in the first act. Nothing is egregious, but it is enough to take notice. As for most modern OP films some characters are included for no reason other than to have them in marketing material. Still have no idea what Sabo and Lucci were doing. The gambler character introduced serves no particular purpose and just drags down the movie in the middle.
The main villain is compelling ideologically, but never gets quite enough attention to make sense. His devil fruit is busted to the point it is completely unbelievable, and the main confrontation between him and Luffy suffers as a result. Cool idea, but not enough spice to make him memorable.
Its a good One Piece experience, but outside the outfits and nice cuts of animation provides nothing to remember it by.
Score: Strong 6 to a Light 7
