I've used this site many times to research things, and found it to be incredibly useful. But recently I had the opportunity to post up information on Wiki pages that deal with an issue that I specialize in, and I found out how dysfunctional Wikipedia was. As near as I could tell I was in full compliance with their posting policies, but every time I posted information, it was taken down immediately. When I asked why, I was told it was because I was not an expert. When I probed further it became clear that the person who thought I was not an expert clearly knew far less about the posting topic than I did, and wasn't really qualified to judge my expert status either way. I actually am the Only independent national expert on the topic that I was posting on. After 3 days of back & forth discussions with "citizen monitors" who would not let me post any information, I came to the conclusion that the volunteers who control the posting process and have the right to take down legit postings were poorly trained, and that it would take less time to use other venues to get information out on my topic.
So given the problem that I had trying to contribute useful information on a topic, I have to assume that many other Wiki pages are also compromised by the actions of poorly trained volunteers at Wikipedia.