As a Wikipedia addict, I can tell you that anyone who considers themselves an expert can edit articles that they consider not exactly correct. Of course, you might get a re-edit, but it'll at least inspire whomever's doing the re-edit to discuss why they're stating the information they're stating in the article's discussion page. And you have to provide sources for anything you state anyway. If you have a real issue with anything and can provide proof that you're right and [x] is wrong, then please feel free to do so in the discussion page while you edit the article and your edit will stand. And as far as categories go (which the top post isn't considered as, though it does link to a category), they're really dependent on the category or categories a particular article gets slotted into. Oh, I could go on but I think that'd create a soporific effect for many of you so I won't.
