I think it releases some of the control you have over your browsing or information finding experience, but in a good way. Interesting and thought provoking links appear on your - front page? - you click, you share, then follow and trust specific users to bring you more. It seems to prioritise more in depth usage... without competing for comment karma, there is no incentive for shallow, easily digestible responses.
Or maybe there is. I have no idea, I've only been here five minutes.