If I were teaching students to research, I’d probably use Wikipedia as an example of a suspicious source. Then I’d use well sourced Wikipedia articles and horribly sourced ones to explain the difference (See? This one has citations.). And probably leave the kids with: when in doubt, throw it out. If you aren’t sure about a Wikipedia article, use the sources it has to continue researching, but don’t use the information in the article. But overall, I’m pro-Wikipedia.