IMHO, it's completely ridiculous to compare Divinity 2 to Dragon Age Origins. I'm playing and enjoying both of them in my PC right now, after I spend my last month on Risen. Although, Div2 and DAO's genres are RPG, they offer completely different experience. To me, both of these games are rare RPG gems. With Drakensang and Risen, these four games are the fantastic four of 2009 for me.

But let's compare Div2 and DAO:

1- Graphics: Div2 offers nice graphics, sharp textures, beautiful colorful landscapes, some buildings like towers, temples were carefully and skillfully crafted by artists, and sometimes I find myself to stop and watch these beautiful scenes. This full of color graphics style reminds me Fable series by the way. DAO's graphics offers nice animations and character textures, but environment graphics are usually consist of low-resolution textures, which was a disappointment for me. But, they used rich animations and effects like bloom to cover these downsides. Overall, DAO uses much gray tones unlike Div2 and it perfectly fits the dark atmosphere and setting of the game. One of my biggest complaints in Div2 is about the small sizes of the texts fonts, while DAO uses easily readable ones.

2- Gameplay: Gameplay is totally different for the two game. Div2 offers action oriented, single player based, real time hack&slash combat, while DAO offers tactical, party based, pausable real time combat. But, both games are more than just combat. While combats are very important for both games, there're plenty of dialogs, puzzle solving and exploration in both. There're plenty of gameplay diversion in Div2, like mindreading, golem making, turning to a dragon. These new ideas offer plenty of innovation to the RPG genre I think.

3 - Atmosphere: DAO has a pretty dark and grim atmosphere. Sometimes too cruel and bloody. While Div2's atmosphere is more faboulous and light. But, this does not means Div2 is a childish game. In both games, player must make choices in quests that has no certain good or evil way to solve it. Both games' target audiances are 18+. But, I must admit DAO's atmosphere is more captivative than Div2. Character personalities are much more detailly crafted in DAO by the way.

Divinity 2 is the worthy successor of Divine Divinity, while Dragon Age Origin is for Baldur's Gate 2.