I have adopted the following policy about Wikipedia, and I think it reflects current state of affairs:<p>1. It is a decent repository for bare facts that can be easily verified elsewhere, but assembled there in convenient form. E.g. if you need to know the population of Nepal, Wikipedia article about Nepal is a good way to go, even though multiple other sources are available.<p>2. It is a decent source of links for more complex material - e.g., if you want to get a quick idea about what suprematism is, without knowing anything about it, and how to start researching the topic, you can use Wikipedia article, extract such keywords as "visual art", "Malevich", "russian avant-garde", etc. and take it from there if you're interested.<p>3. It is a somewhat useful, but a dangerous source about any concepts that are in any way controversial - you should verify all claims and read all links, but you can use it as an assembly of links and keywords, without assigning too much importance to any narrative.<p>4. It is absolutely useless for understanding any seriously controversial topic, as at best controversial articles would selectively present facts, reflecting biases of the writers, at worst - explicitly promote specific approach to the topic, which will be ruthlessly enforced by either the mob of opinionated editors or the wiki bureaucracy masterfully exploited by biased insiders.<p>To the defense of Wikipedia, some mainstream encyclopedic sources, especially ones published in non-free countries, suffer from even worse bias problems. I don't think there's a solution for this, except using one's own mind and take everything told to you with a grain of salt and check it when possible.
Obviously, the topic described in the article falls into the third or fourth category, and so expecting Wikipedia to have anything but bare facts (like dates when it happened, names of the participants, etc.) right would be a bet, and not a safe one. In most cases it'd be whatever the random Wikipedia "guardian" or anonymous mob of agenda-bearers wants it to be. Sometimes the experts make the fuss that hits some popular media and particular article gets better, but most would give up and decide not to waste their time.