It's actually all crowdsourced. Anyone can add new Viewpoints, improve existing ones etc. Reviews typically go out of date very rapidly so we're building something that can be constantly updated/improved. I guess the UI has a long way to go before it's obvious how it all works.
For example here is a pretty great rundown of CSS pre-processors (http://www.slant.co/topics/217/viewpoints/1/~best-css-prepro...). You can click through to see discussions, previous edits etc. (please ignore the lack of data in the bar charts on the "summary page", it's a brand new feature)
(also, I did a little stalking, you will like our stack: node, backbone, coffeescript, stylus. All single-page as well :)