I don't like it.
I keep getting the feeling that motion capture and this push for absolute realism is not for video games. It comes off as lazy, even though I know for a fact that it's nothing of the sort, but I feel like motion capture kind of washes over an important handmade quality. Animation is an art, and when you do everything automatically and procedurally you lose some of the spirit of the thing.
Look at what Valve did with Portal 2. They managed to make a little robot ball more expressive and emotive than just about any character I can think of in a game that focused on "realism".
I agree yet at the same time it doesn't worry me, because you will always have two separate groups of realism. Realistic, and not realistic. You will always have games that use the latest technology to try and create, living, breathing, real worlds and people, but you will also get stuff like Fall out, Dragon Age, Borderlands, and other games that don't go for realistic, but more artistic, stylized graphics.