The fact that this movie is lackluster stems from the inherent problem that it tries to condense a roughly one hundred chapter arc into about two hours. Of course this leads to a LOT of editing, so if you've never seen/read the Alabasta arc you will be confused for most of this movie. This would suggest that the movie's intended audience would be those who already have an idea of what's going on, however so much has been changed or removed that you'll frequently find yourself saying "That's not how it happened" or "They skipped over that!" or "Where is Mr. Prince!?" if you're anything like me.
That isn't to say you should skip this movie entirely, it does have some merit. It's One Piece, so of course the heart of it is spectacular, and if you're a die hard One Piece fan you will definitely enjoy it for the same reasons you enjoyed Alabasta in the actual series, even if it feels rushed. However I would say if you don't know much about One Piece and are looking to get your feet wet, this is probably not the best choice for you.
I would highly recommend this movie to people with an extreme One Piece obsession, who want to consume every piece of media that has anything to do with it. Anyone else may be disappointed.
