Dragon riding was never the point of this DLC and if that was what got you to buy it you aren't a TES fan at all. A dragon IS NOT a horse. They are intelligent creatures not just some pack animal. You don't tame the dragon you just convince it to help you for a time. It fits perfectly in the lore so get over it.
If I can bend a dragons will, then he should go wherever the hell I tell him to go.
Bend Will - "Your Voice bends the very stones to your will. As it gains power, animals, people and even dragons must do your bidding."
There's no point in watching a dragon fly me around a group of people for twenty minutes, when I can just call one to clean up the mess (if any).