I just got in the beta today and I have to say I'm very disappointed with how Dragonriding feels, especially after everyone hyped it up as being "better than normal flying". I can't speak for everyone obviously, but I would much rather prefer if I could just press and hold space to go in the air like you do with normal flying mounts. It feels awful that you can't do that with Dragonriding. I would compare it to the feeling of not being able to jump in a video game. Terrible.
The special actions also look and feel very clunky, they don't flow together nicely at all. Not a fan. I hope they ditch this gimmick in the next expansion for sure.