Do this for any company that asks you to review their employees always.
You wouldn’t believe the number of times I swear I get 4/5 star ratings at my job just because the way people think is “well 5/5 means perfect and nobody’s perfect, 4/5 is good!” The company I work for doesn’t understand this common mentality at all, and will let people go over not having consistent enough 5/5 ratings. Obviously they don’t inform the customers of that.