I didn't play the Trial of Flame Event but I did play the rest of the game. It was pretty fun. Although the story got quite repetitive and there was no badge for completing it. Almost all the badges were miscellaneous. Completing the dragon index is quite difficult and RNG based and the skins do nothing and don't stand out that much (edit: I figured you cannot complete the dragon index after the trial of flame event). Switching dragons after obtaining your Night Fury is a waste of time so I released all the dragons I got from the eggs because my inventory would get full. Overall I would say it's a good game.