I saw it saturday night and LOVED it. If you haven't seen it yet, see it in 3D, but skip the imax unless you've got a real IMAX theatre.
The story has been done before, but it was wonderful. People could really learn a lot and apply the story to our current reptile-related saga: learn more about the things you hate, and you may just end up liking them.
That said, toothless is my new favorite thing and I'll be getting this movie on DVD.
:D