The story is rather lacking, even though I like Emberthal and Ebyssian as characters.
Dragon Flight doesn’t take any risks and therefore doesn’t garner any emotion from the players. It doesn’t help that we start the expansion as, well, some sort of Carnival Cruise instead of racing to prevent the destruction of the Dragon Aspects.
There are some glints of character driven story (Sendrax, the Old Red Dragon, and the Dragon Maw Orc) that stand out, but they’re woefully far and few between.
If I had to say what the problem was specifically, it has to be the Dragon Aspects themselves. You rarely see them outside of the city hub, akin to Wyrmrest Temple in Wrath, and they seem completely indifferent to the Primals as a whole.