Saw this with my three year-old nephew and eighteen year-old niece. Nephew promptly fell asleep, niece liked it. I liked it too, so all's good.
Extraordinarily beautiful animation, and well worth watching just for that. Very action packed story, plenty of easy-flowing visual humour, excellent pace.
- I only had a couple of minor issues with it. As usual, very Western-centric (seriously, the Easter Bunny and the Tooth Fairy are not universal myths that every child in the world believes in).
- The Sandman (cute as he was) is seriously not one of the myths that kids believe in even in Western cultures. I'd say that far more kids believe in the Boogeyman than believe in the Sandman, which kind of inverts the plot of the story.
- The voice actor for Jack Frost was way too old. Jack looks about 12. 14 at the most. A voice actor who sounds mid-twenties was leading to some severe aural dissonance.
But still, well recommended for kids and adults alike.