Being a fan of the depiction of good dragons, I was planning to see this movie the minute I heard about it. Let's see...I loved Toothless and the dragon characters, found some of Hiccup's actions annoying (for the first half or so of the film I found myself siding with Gobber and Stoick more often...at least when he was asking questions in the middle of training), and the ending caught me off guard. I plan to buy the DVD as soon as it comes out.
I have to ask though, was I the only person who didn't go "...um" when Stoick gives Hiccup the "matching" helmet? I was looking at it from the Viking's POV and I honestly agreed with Stoick; it's a memento; and it keeps the memory of the mother close.
I also noted how people point out how the Toothless of the book is a completely different dragon from the one in the movie. Well, I came up with a vague (more like a WMG) answer to that solution. Toothless, in the books, is Hiccup's dragon, but not his riding dragon. A larger dragon named Windwalker fills that role. In the movie, a Terrible Terror with Book-Toothless' colouring is fed by Hiccup, and it later goes to sleep by him. My answer? Swap the names, and continue from there. Hiccup later adopts the Terrible Terror, dubs it Windwalker, and he acts as a delivery dragon for him. Canon Equilibrium Restored.