Available on Netflix, I watched this with the juniors this weekend and was very pleased with it. The animation is amazing, and the story magical. Its a bit dark in places, but those parts are more than balanced by whimsy and scenes of the magical elder forests. It handles both Pagan and Christian mythologies with reverence, which is nice as I more often see one favored and the other vilified.
Best of all, no dick or fart jokes, guest rappers, contemporary references, or celebrity voice-over shenanigans, all of which seem to infest so many kids' films these days. The best kids films (imo, at least) are the ones that are timeless, and this one definitely fits that bill.