To avoid confusion on what specific sections are evaluated on, here is an explanation:
Audience:
Based on the size of the site's audience what they do for them
Community:
Based on what how the interacts with other sites (affiliates, etc.)
Content:
Based on the amount of content
Design:
Based on the quality of the site's layout
Growth:
Based on how frequent updates are and the site's overall growth
Interactivity:
Based on features that interact with the user (forums, etc.)
Organization:
Based on the site's navigation
Uniqueness:
Based on unique features of the site
Usefulness:
Based on how useful the content is
To find the overall rating, I find the average of all the scores added together.