Hmmm......
Really good animation and a song that I love still don't make this perfect. Despite the animation being well the character's faces didn't always seem to portray the emotions the song put before them to portray, such as Santa, I felt he needed to look angrier, darker. Also the song, when the characters speak it, has small pauses in certain parts that are just long & frequent enough to annoy someone.
Also, one last complaint I'm not really sure is relavent, but maybe someone else hneard it too: It seems to me the voices have been tweened a bit from the original to try and sound more like the actual character who the voice belongs too.