Propools - 5:02 pm on Apr 24, 2013 (gmt 0)
Good rule of thumb would be to "view" these sites as a user would.
1. Are they helpful?
2. Do they provide relevant information or is it boiler plate or scraped data?
3. Are they an affiliate driven site?
4. What is the quality score for the site?
That's only a little of the criteria we use.
Hope that helps.