What Are Ratings?
The forums allow you to rate threads between 1 thumb (terrible) and 5 thumbs (excellent). Once enough votes are cast for a thread, thumb ratings will appear next to its name in the listings. This is the the average rating, which can be a quick way to see which threads are worth reading.
How to Vote
Click on one of the thumbs on the thread page. Vote thumbs up if you like the thread, vote thumbs down if you don't like it. The score (technically called "Deal Score") will update right away. You can change your choice of rating at a later date.