I grew up as a huge fan of the franchise - this movie was an amazing closing scene.
(SPOILER ALERT)
Obviously when the dragons left...emotional and sad. Darn, what an awful ending.
NOPE! We get to see Toothless, the light fury, and their kids reunite with Hiccup. We get to see Hiccup and Astrid as adults, with their kids. IT WAS A PERFECT ENDING, WHICH IS WHAT TIES IT UP. Plus, the plot was actually interesting and in some parts funny, which is literally all you can ask for. One of the greatest. movies. ever.