Very interesting! I like it :-) Do you have community of critics already? I would much more like to review such things with larger community rather than several people I can ask.
The site has been live for just around a week- so I am working on it. Soon, I hope! Feel free to append the Uxreview link to your post, to get all the hn crit consolidated on one review at Uxreview- hope that's not too presumptuous. Cultivating a community of insightful design and product people is my biggest goal right now. First on the list is a better landing page, right after that a latest/interesting activity page.