3-D was what made the movie worth sitting through, however, it was entirely too long. A movie for children and Sci-Fi afficionados. Certainly not on the level of "Titantic" or even "Alien". I find it absurd that there is a warning about smoking in this film and the Sigourney Weaver character is so interested in preserving an envirionment and a civilization, but cannot control her smoking habit. I doubt I would see this film twice.
Commenting any further on the obvious 3D experience is superflous. What impressed me the most once I got over how good the 3D effects were, was the quality of Jim Carrey's performances and above all, the story itself. It has always been a great story, but the Disney magic brought the messege to me loud and clear. This is not so much a story of Christmas, but an opportunity to take measure of one's life.