I'm a passenger, have taken 276 trips since June 2015 (~6.4 trips/mo.) and my rating is 4.79.
I received a 1 rating at least once while trying to help out a drunk friend in trouble... sent a car for him and apparently he thought they were going to help him move and he loaded her car up with tons of stuff, his dog, etc... she called me asking me to tell him to get his shit out of her car and that she wasn't going to drive him..she ended up having to call the cops lol
Life is like a box of chocolates, it doesn't last as long for fat people.