Just watched the movie (720p blu-ray version from INP), glorious! Really enjoyed it.
They balanced a lot of great stuff well. The side character plot of the feathered village folk was nice, and given just the right amount of time without any long sappy flashbacks of their hardships, but enough for us to care. Nami really shined, and Shiki was a very solid villain, plus Luffy and the crew all had their cool moments. Good humor, good drama. And beautifully animated!
And it was fun seeing the crew dressed all classy gangster style, and firing huge guns like in some of those Oda color pages, cool stuff.
Only a couple nitpicks, one being Robin seemed to get the least time to shine out of everyone, always wanted more of her on there. Also, I would've liked to see Luffy give Shiki a more thorough pummeling in gear second, a longer fast sequence of fighting/beat-down before the finisher.
All in all, very satisfying, awesome film. Easily the best One Piece movie.