General opinion? Well... Drakan with good 3D. Nothing new.
Drakan was much better - you could attack ground troops and set scenery on fire! Watching those goblins in 'Order of the Flame' run in terror as you swooped down on them was one of those OMG gaming moments, and being able to burn down a watch tower with a few well placed flames at the base was also awesome.
So Divinity disappointed me in that respect, but it is still a great game.
Also I agree that Dragon form was much weaker than human form. In fact, when faced with a major aerial fight, I'd usually switch to human form and pick off the enemies when they got close with fireballs (and benefit from my health regeneration at the same time). The hardest sections of the game for me were where you were 'stuck' in dragon form, e.g. in the dream sequences.