There are a few great moments between Toothless and the new dragon with some legitimately beautiful cinematography, but the story overall is only mostly passable. The main supporting characters are so aggressively obnoxious that even if someone else were watching this movie I would only stick around for the scenes with Toothless. The movie is going for irritating humor, and if you enjoy that then you will probably get more mileage out of it than I did.

Closest Comparison: The same thing is happening to this franchise as happened to Shrek.

Setting: Fantasy
Plot: Adventure
Tone: Comedy