Can't say I'm particularly fond of the idea of strapping a jet-pack onto the back of a dragon and initially it did put me off the game quite a bit.
Dragons are not meant to have Jet-engines strapped to their backs or anywhere else for that matter, the forces at work would tear them to pieces!
Isn't it weird the things we choose to question?, I have no problem with the Idea of Dragons/Magic.etc or even Jetpacks themselves but yet the idea of a jetpack on a dragon I find absurd... weird eh?
That said having seen the lets play video it looks like an awesome game and I'd be interesting to see how the flight mechanics of the dragon work as one of the things I really enjoyed about D2 was how the dragon reacted to changes in direction.etc