Of course, many people who bitch about Wikipedia and how it doesn't work complain that their edits were undone, often because they added information without a reliable source for verification.
The issue I've run into is that sometimes there simply isn't a "reliable source" other than people that are intimately familiar with the topic at hand because the written information is under an NDA or otherwise inaccessible. In my particular case, it dealt with the monorail system at Disney World - I worked there for years, was a trainer on the system, and know a fair bit about the internals of the trains and control/signalling system, as does any other driver with any experience. However, Disney and Bombardier are pretty strict about controlling the availability of any official detailed printed/electronic documentation, so in the end I ended up just giving up and letting the incorrect information that was in the article and the half-assed "citations" stay there because the only authoritative citations were in documentation that was unavailable to the public, and I got to the point where I just didn't care anymore whether Jimmy presented bogus info while claiming it was accurate.