Another review was posted in the german section.

http://www.krawall.de/web/Divinity_2_Ego_Draconis/review/id,50767/page,1/s,,c

I used a translator to understand it. Though it was awarded a good mark (81% if I remember well), according to them, the dragon gameplay seems only to be a gimmick and not a big part of the game.
It lacks precision and the dragon does not fly "naturally", seems very limited and not enjoyable.

I am hugely disappointed here frown I thought it would be one of the top features of the game.