Many factors are important in determining a good web site.
A page that is relevant for one subject may not be for another. Rating them has to be in the context of what you are looking for. You cannot always tell from the title, or from what a search provides, if the information contained will be useful. This page would not be helpful if you are learning about Socrates teachings but it does contain relevant information if you are learning about L. Ron Hubbard s teachings. The links that are available from a page are just as important as the content of the page itself.