I saw this last week. I have to say I was surprised by some of the humour and found myself chuckling at the opening scenes (bearing in mind my sense of humour usually revolves around jokes not suitable for a kids film
). I don't think I'll be rushing to get the DVD I have to say but it was fairly entertaining and at least I didnt actually regret going to see it. Having said that I disagree with most of the comments so far about the designs of the dragons. I found Toothless to be far and away the least interesting (design-wise, not in terms of facial expressions etc. which were obviously more developed for a main character) of the dragons. I loved the others, they were a bit silly and a bit caricature-y (?) but that was a good thing because it fit with the tone of the movie and they were fun. The vikings were similarly portrayed and I don't hear anyone complaining about that. And the vikings were real.
Without wanting to sound like a whiny kid, I do think some of you take the subject a little too seriously when it comes to the technicalities of dragons in movies.