Two is better than the first in my opinion (I can see why some might like it about the same or even slightly less than the first), even if I am not a huge fan of the McGuffin since it really contradicts the first movie.I watched the original How to Train your Dragon recently, and I'm wondering, "How good is the rest of the series"?
The third is the worst one, but its still overall very good. Honestly, How to train your dragon is actually a rather solid trilogy now that I am actually thinking about it.