I just saw the vids from gamescon, Color me intrigued ^^.
Bullet Hell Dragon Action with Strategy-rpg added into the mix - unless you muck it up in some bad way (like that one dragon based ps3 launch title that plummeted straight into the ground) you have a sure sale on your hand.
You mean Lair? That sucked because of the horrible controls (it was controlled only by motion detection) and lacklustre story.
As for Project D (DC) game length is around 20 hours single player so I think the really epic game is going to be project E aka Divinity 3. Nevertheless Dragon Commander looks like a fun game to play but it's early days yet and it should get even better going by Lar's recent posts.