Somewhere I saw a comment to the effect that MSDN feedback seems to disappear into a black hole. I can't speak for any other documentation teams, but I do look at my MSDN feedback. Most comments fall into one of these categories:
Category #1 is easier to address than category #2. If I can confirm there is a specific error on a page, I try to fix it as soon as possible. (The reality of our publishing process is that my documentation is updated at most once per month, and generally less frequently.)
Here are some actual customer-reported errors I've fixed recently. (The last fix is not yet live.)