Agreed, we shouldn't duplicate anything that Wikipedia already does.

However, Wikipedia is an encyclopedia of general information and, explicitly, doesn't want the role I am advocating here. While users try to expand the role of Wikipedia, the mediators want a narrower role for Wikipedia and would probably appreciate a complementary site for the purpose of analyzing information.

Wikipedia:

Articles may not contain any new analysis or synthesis of published material that serves to advance a position not clearly advanced by the sources. from here

I would be open to petitioning for some kind of "WikiAnalysis" sister site, but that would do little for R-outreach (Is R-outreach something we are interested in?) and we'd be able to do it better.