smartest way for a person to know where each of your website's pages are
locate. With the help of a sitemap a user does not need to go around
your website trying to search the information he requires. A simple look
at sitemap will show him the page and a click will take him there. This
is simply just the single use of sitemap
In my opinion - when your site's architecture and navigation are
brilliant, you don't need to prepare site map.
You don't need even if they're just OK.
BUT in some cases, when I just HAD TO find specific document inside
of complicated site - site maps was the last "life belt" for me. So
- unless you are completly sure that your site will not grow fast in
it's lifecycle - making even automatic site map should be proper