The rating of a resident's skill in a certain field (behavior, appearance, and building) given by other residents. Ratings are used to show appreciation for another resident's creations. A resident’s ratings can be seen in their profile and can also be found out through scripting. It used to be possible to give a negative rating but this was removed after abuse through the feature (residents would "mass-neg-rate" other residents through use of "alts" or friends). The amount of ratings a resident had also used to determine how large of a stipend bonus they would receive but this feature was also removed.
A simulator's rating is shown at the top of the screen when inside that simulator or by hovering the mouse over a sim in the world map. Sims can be rated either mature or PG. The rating of a sim can be changed through the estate window by the owner of the estate.