After Monsters vs. Aliens didn’t perform so well, Dreamworks seems to have taken a cue from the success of Pixar, as well as their own Kung Fu Panda, crafting a film around interesting characters you care about, with a story that grabs and thrills rather than inundates with as many pop culture references, fart jokes and celebrity voices that could be crammed into 90 minutes.
Dragon has a simple enough story, about a boy and his dragon, but it is told in a heartwarming (but not overwrought) way, with enough action and grandiosity to give the film a nice balance.
The only negative thing I can think of is, the film was not hilarious. It was funny, but not laugh a minute. This is not really a bad thing, since the film was reaching for a more sentimental tone, in which it succeeds wildly.
Also, I did not see it in 3D and you can venture here to find out why.