Are they using some sort of custom engine this time? The game looks a lot worse than Mass Effect, though I suppose the change in scenery may necessitate that.
Mass Effect didn't have a single blade of grass nor tree (outside of inside cities). Rendering huge spaces of, uhh... sharp, flat mountains is pretty easy even for the clown PC.
While certainly true, that doesn't change the fact that it all looked really really good. I'm replaying it on the PC and seeing it all at a rock solid 60 fps is just stunning.
On the flipside, I thought The Witcher was actually akward looking. The character models were even remotely close to Mass Effect, the animation sucked, and the whole thing looked cheap. I know it was rendering more on screen at once, of course, but that doesn't make it attractive. Dragon Age looks similar to The Witcher to me. In some ways better while in others worse. Neither really impresses.