This is the best movie coming from a shounen anime. I am not a fan of One Piece. I watched this movie 5 or 6 years back and I loved it. I become obsessed with this characters and their powers and this gorgeous world. After watching this movie I started the series, skipping the filler episodes. The series is not as good as this movie but you can get some entertainment out of it as long as you skip the filler.
Now back to this movie. The world here is just breathtaking. The visuals are amazing with the vibrant colors and all. I love the enormous creatures, the big trees and the floating islands. The characters are not that dull as in the series when they only laugh about stupid stuff. They are written preatty good for a shounen movie.
Overall this movie is a spectacular piece of animation that I really enjoy and appreciate it.