Quoting from the website:
You may have noticed that some of those are things which would be good in a wiki :-)
However, I've only seen implementations that hold on to the notion of sole ownership of content. It seems to hold to the idea that only the person who wrote something should be able to change it, and that everything written should be tagged with authorship information. This facilitates the mechanized rating/trust system, but hinders collaboration. Whether this assumption is an inate part of the software, or something held by those implementing these particular sites, I do not know.
Editors are selected according to how much other editors like them. this creates problems if one of the editors decides to abuse his powers, because there is no review mechanism. Are you going to remove editor powers from a friend of yours?
Can everyone guess my big complaint about existing EverythingWebSystem sites? I can't get a RichSiteSummary feed from 'em. I find things, but they don't get updated. I'm a big PerlAdvocate?, so a PerlMonks feed is desired but not forthcoming. Grr. --DaveJacoby