Like my review of Monsters vs. Aliens this is another movie that I think would have been more enjoyable in 3D. The visuals were already pretty decent, 3D would have made it that much more spectacular. Otherwise that plot doesn't hold up too well.
The story focuses on the a young Viking (prince?) named Hiccup. He's kind of a weakling and he spends the early half of the movie wanting to become a dragon fighter to make his father, the leader (king?) of the Vikings, proud. He successfully shoots down one of the most powerful and mysterious dragons known in their lore, the Night Fury. He has the opportunity to slay the dragon while its down but instead decides to train and rehabilitate the creature. This changes his outlook on killing dragons, just as his father was warming up to the idea him being a dragon slayer. Hiccup is an interesting case to say the least, he's not an example of the "cool loser" trope but his character still manages to be kind of a cliche "I'm different" sort of guy. I was irritated by his snarky use of sarcasm and his nasally voice. "Yeah movie we get it, this isn't your traditional viking kid... ha ha ha". The movie focuses mostly on him while introducing a few others who are mostly stock characters. The tough "jock", the action girl love interest, a D & D nerd set in the ideal timeframe, and a set of fraternal twins who constantly bicker with each other.
This isn't a bad movie. The message is good, and as I said the visual were even impressive in 2D. I just found it lacking when observing the plot alone. There were a few surprises that I won't spoil for you (even though it would be a late spoiler), where I'm surprised the film would actually go THERE (towards the end). If you're a big viking or dragons fan, go see this movie. If you have a 3D tv go see this movie. Otherwise it doesn't live up to the hype.