what you may not understand..(or care).
if you rate a driver a 4 (or less). you basically, telling uber to fire/suspend his/her driving account.
if there overall average rating falls below 4.5. they are deactivated from driving..
that's why the drivers all ask & beg you..
uber doesn't explain this to the customer very well (if at all).
so most people give 3 and 4 thinking its average. no harm no foul.
but you're basically getting the driver terminated.
uber know its can hire thousands of new drivers at any given moment, so they dont really care.
most uber drivers at best make $8 thru $12 an hour. and its his/her only source of income.
plus most cities are under $1 a mile. (the driver isnt really making any money, after car note, oil change, tires, etc.).