Interesting. This company uses a smiley-face rating system for their customer support. And they publish the last 100 results.

After every interaction with our support team, a customer is asked to rate the experience by clicking one of three ratings: “It was great” (happy face), “It was OK” (flat-line face), or “It wasn’t good” (frown face).
via 37signals: Customer Support Happiness Report.

At Autodesk we use a scale from 0 to 10, which is broken down like this:

0-6 )-:
7-8 |-:
9-10 (-: