The animation really sucked in this one, and the art and animation was pretty lackluster throughout with the exception of some of the scenes where Vergo is torturing Law and some of CC's facial expression. Even bits that would lend themselves to creative art and animation, like Mocha's hallucinations, come across as dull. The bit where the dragon runs away from the sled is terribly animated.
Also, no one mentioned this, but a suggestive situation involving Usopp's nose was too good for Toei to pass up. It's obviously an attempted callback to the very similar scene in Drum Island that no one asked for. Except it doesn't really work here since Nami is in Sanji's body (or does it :ninja:)
Really, the only highlight was Vergo and CC.