Are the tools we are using effective?

This past week, we have been looking at effectively using the internet resources that are available.  One step that we needed to take was to create a web page score sheet or rubric that would allow us to determine if the internet resources that we are using were appropriate for what we were trying to get out of them.  We were given two examples one from U.C.- Berkley, and one from Discovery Education.  I found it somewhat funny that after I was done with all of the creation of my version of a rubric, that I ended up scoring Discovery Education (where one of the score sheets is from).  The main reason that I used Discovery Education as one of the sites that I scored is that I tend to use many of the streaming videos from the site in order to help my students understand the subjects that we are learning better.  The link to my blank rubric is here and the scoring of Discovery Education as well as the score of Sciencebuddies.org are located if you click the link in the name.  If I hadn't had these sites recommended to me in the past, I would never have thought of them.  As it is, I use them extensively during the school year.  My only issue is that I am curious if my scoring rubric is too easy.  Will it give most web pages that even attempt to stay educational a good score?  What else could or should I have included in it?