I agree with bronson about the uniformity of the blur. Also, the amount of blurring doesn't change enough as the distance changes. It's better than previous techniques that have just blurred the entire background the same amount, but it still doesn't feel right. That's understandable; it's an incredibly hard problem to figure out how far away everything in the image is, and blur it the appropriate amount. I'm impressed by how well they've done so far. But there's definitely still work to be done.