Any Luncher who is logged in can rate topics. The community rating scale shows the average rating of the data point on a scale of -5 to +5. The scale starts at -1 for mild dislike to -5 for strong dislike, and +1 for like and +5 for strong like. Below the rating scale are the number of members who have rated that topic, the average community rating, and a dropdown arrow that gives you an idea of how others have rated the topic.
To rate a topic, hover your curser over the rating boxes and lock in your ratings by clicking on the number that represents how you feel about the topic.