The fourth One Piece movie was, I felt, far better than the third one.
The Straw Hat crew find themselves in desperate need of some cash. Luckily, there is a race with a big prize pot to enter. But of course, things aren't that simple.
While the plot centres on the race, the real story was grounded in typical One Piece themes: family reunions, traumatic childhoods leading to obsessions and passion, and lashings of drama alongside hyperactive action sequences. Considering it wasn’t written by Oda Eiichiro, the manga's creator, it was very much in the spirit of the series, and an extremely fun movie in its own right.
Gaspard is a nice proud antagonist, but perhaps could have been more compelling. There are also some liberties taken with what the Straw Hats can do, especially Robin, but it all works and it's not as though Devil Fruit powers are all that well-defined.
(originally written 5.6.05, slightly expanded)