The movie has some really fun scenery and effects, but is much more Disney than a typical Tim Burton movie. I expected the movie to run closer to the deep political currents and dark realities as written by Lewis Carroll; instead I watched a whimsical movie no doubt filmed so that Disney can make a new ride based upon it. That being said, kids may still find some scenes confusing and disturbing so it may be best to only go with older kids.
The cinematography and post-apocalyptic scenery was very good, otherwise this movie was disappointing. If you don't like being spoon-fed massive dosages of religion, then I would avoid this movie at all costs. If you're a Denzel Washington fan, then see it only for his performance; he is really good in this role.
This movie is destined to be a classic! I attended the late night showing and, even in a theater full of only adults, the laughter, gasps, and applause was non-stop! I would say that's pretty rare for a family-oriented animated movie. How To Train Your Dragon is a wonderful movie: witty, heartwarming, engaging, and truly funny. It's a fantastic adventure good for all ages. I highly recommend seeing it again and again!