I've been guilty of making excessive usage of Wikipedia in my postings. It seems that some have been less uncritical than me. (Look at "The Cult of the Amateur" section).
Andrew Orlowski has now waded in. His credibility has suffered of late in some quarters (eg here) but today's article is interesting nevertheless.
I find Wikipedia to be useful for the kinds of things I search on. However, I've never attempted to edit any pages on it. Perhaps I should try for myself and find out what the culture is really like.