Or you can just as easily phrase this the other way around. If you were completely satisfied by your service, why should you give less than the highest rating available? Are you just subtracting stars because the driver didn't do things which you wouldn't expect the driver to do?
It seems pretty stupid to have a multi-point rating scale that doesn't distinguish between the driver that gave you polite, timely and safe service and the driver that did all that but additionally gave you fantastic advice about the city and insisted on carrying your luggage up a flight of steep steps at the end.
It's even worse to have a points scale where not awarding the first driver the same as the second moves him a few percentage points closer to losing his livelihood.
I disagree with your first point. I still think it's silly to subtract points from the maximum simply because a driver didn't do some nice things which he or she shouldn't be expected to do, like carry your luggage or give you a million dollars.
