I was not all that impressed by it, until they showed the big mother@#%^ing dragon. That fight was AWESOME!
300 guy as the father viking fit well. The voice of the main character did not, and I was pretty put off by that. In fact, the voices of all the kids were awful ideas.
It definitely wasn't anything major, but it was still a very good watch. A nice, cute little movie that will bring a smile to your face throughout. I disliked the girl's personality though, the one that is also in Hiccup's training class. Not the twin.
I really liked how detailed Dreamworks made the characters and dragons. The lore and storyline just seemed to fit together very well.