This property does not have the same value. Period.
Well, I feel like Chigago wrote it the clearest possible way. When we advertise on Google, we know we are buying a little spot on a great, possibly the best, site, with an image of integrity that will add something to our products. It is completely different when I think that my ad will be displayed on sites I don't even visited once, with matches that still have to be completely tested. I truly wish Google the best with the new technology, but right now this is a distant second choice compared with the original adwords.