It seems to me that pax are quite shallow and I heavily suspect that they rate drivers based on how attractive he/she is. My proof so far is that I am of low average to average attractiveness (probably around the midpoint between the Elephant Man / "face only a mother could love" and Brad Pitt) - about a 6.0 on the 1 to 10 scale. I consequently have a mediocre driver rating of 4.76. Also, I have found that when I wear a hat to keep my bald head warm on these chilly, frosty mornings and therefore conceal the offending baldness, my rating seems to improve. This is scientific research of great importance - please post how ugly or hot you are (1 to 10) and your Uber rating and we'll see if there is a link.