Even as a fan of Diablo, Sacred wouldn't get my vote. It is a poor diablo clone. DD has much more to it in terms of plot and gameplay, and if you like it then you can follow up with the sequel, whereas Sacred 2 just continues with more of the same.
Divine Divinity, when installed correctly (Install as Admin, Play as Admin) is amazing, so immersive, and on the level as Diablo IMO. I found the soundtrack to be one of the best I have heard. I just love the game!