Actually in DKS I've mostly enjoyed playing as a dragon. Other parts are sadly often unpolished and sometimes (Hall of Echoes duels for example) it maked me really angry (I've finished all the battles without any problems- except fight with lord and lady- about 10 save/load). DD just look more "finished". I know what I've to do and still- I can run around main quests and have great fun. In DKS those quests aren't so evolved- just kill someone/ bring something and that's all. But completing Dragon Set in DD is great fun- and I'm doing it fifth time I think...
