Firing for getting nothing but 4's (avg=4) seems wrong (even if they have enough supply that they can afford to do that). Firing for getting 80% 5's and 20% 1's (avg=4.2) seems reasonable.<p>From Uber's FAQ: "We suggest that a partner never asks a user to "rate me five stars". Historically, partners have received lower ratings after asking for 5 stars. If a partner provides exceptional service, the majority of time he/she will be awarded five stars!"<p>This seems to ignore the fact that exceptional service is, well, exceptional.