The ratings are color coded as follows:
GREEN SHADES - Good to Excellent
YELLOW - Unsatisfactory
ORANGE & RED - POOR TO VERY POOR
BLANK - As yet unknown
The ratings are user ratings - which is why it is important to take the time to rate sites using the WOT tool. The WOT Sign is a ring at the top of your browser which changes color as you surf different websites. The Firefox Browser has the additional feature of a popup warning screen when you are about to visit a site with a REALY bad reputation on all counts. It takes between 3 to 5 minutes to download and install this feature - but it's really worth it and saves much crying and irritation later, when you have already picked up a virus or got into some other kind of trouble with untrustworthy vendors, and so on.
Now, here's the thing: If you want visitor's to YOUR site to trust what you have to say and to trust the links that you provide to other sites, you need to have an easy way of checking those links - THAT'S WOT! WOT I am saying, is that it's not enough to have a site with a good reputation - CHECK YOUR LINKS (and sometimes even the links of the links)- and be well and happy WOTTING!