Lis'n 'ere, you little...
Jokes aside... Being Dragons and Furrybait isn't the issue. They are just remarkably lazy for how much they clap themselves on the back. The customisations for one are basically just 50 more textured layed on. The difference between faces is just about above Pandaren-Level, because you can change the muzzle area... but they always got the same eyes, same headshape... If you put 50 Dracthyr in a room, you will likely get at most 3 distuingishable looks together because of horns and and colors. And considering the level of blizzard-bullshit talk they gave with the "millions of options" thats quite pathetic.
Of course there is more. I could run a 30 Minute rant about how lame they turned out to be, and how this is evidently just corner cutting if you put them next to how Worgen handle their transformation...
And don't even let me start of the 1995-Raver Look the Dracthyr get in their Humanoid form, which is not for 1 second able to hide they are just rehashed human and bloodelf models again.