I've read various posts in the forum, such as:
Do you realize that giving a driver a 4 or below is considered a 'fail' for the driver? If a driver's average rating is below 4.6, a driver can get de-activated from driving, must take a course, paid out of their pocket to get reinstated. Did not happen to me, but I've read it has happened to others.
And on my own, drivers seem to expect 5* ratings for doing their jobs. I find it a bit ridiculous. If I have a scale of 1-5, but the only ones that people choose are 4 or 5, you lose the whole dynamic range, especially if the driver gets "in trouble" for getting "down" to a 4.
1: Driver killed a pedestrian/biker enroute
2: Driver almost killed a pedestrian/biker
3: Something was wrong: dirty car, rude driver, poor driving skills
4: Good, courteous
5: Excellent
I've experienced everything from my scale of 2-5. But if I give someone a 4 (a "B", average) for doing their job, how do you recognize people who are actually a pleasure/great?