How do angel star ratings work?

As part of closing off a project and giving your Cause testimonial, you will be asked to rate your Angel out of 5 stars. This rating is important in order to praise the Angel and make them feel appreciated for their support. 

The Angel star rating is equivalent to: 

1) This skill wasn't used or I didn't see it in this project
2) Skill level lower than expected 
3) Good
4) Better than expected
5) Outstanding skillset