You can view token ratings and rate tokens, which helps the community assess a token's reputation. It also allows you to keep track of the coins you've already seen and your rating of them. So, the next time you come across the same coin, you won't waste time researching it again.
Note: You need beans to be able to rate a token.
You can easily rate a token on its own page, where you'll see the following:
1 - The token's current rating
2 - Clicking on the stars will allow you to rate the token.
3 - Your rating will be displayed. (If not visible on a token, it means that you have not yet rated that specific token.)
You can also view your rating history on your account settings page