Earlier quoted context omitted.
Maybe slightly off topic but I don't get what the point of Uber driver reviews/star ratings are. The passenger can't pick what driver they get, so who are those reviews helping? I have a worrying suspicion that it's only so Uber can put pressure on drivers in some way.
Drivers get removed from the service after their rating drops bellow a threshold, so yes, it matters a lot. Drivers also tend to prefer high starred riders and might reject low star riders.
Frankly, and probably to the detriment of a few ultra libertarians in here; I prefer a government regulator with established processes, a mandate and enforcement for drivers to observe rest times and drive sober and a requirement by law to be properly insured and health - (let alone background-) checked if you drive people around on a commercial basis to a completely arbitrary review system, which is a joke to begin with.
I can't judge Uber, since I never used and never will use it. But just about any other review system is rather unreliable. That 4 1/2* restaurant on trip advisor, which is mediocre at best? All those 5* AirBnb reviews for places where you have to tip-toe around strangers and find a constantly occupied bathroom? This would get a 3 * rating - if you feel generous - if that would be a hotel room.
edit : spellos and slight clarification