Say I have a FB-based profiling system that will calculate the star rating alternative. It works slightly better than uber's current rating system. Ie, it's a better measure of how much you will like the driver. It also works before the driver takes his first fare. In fact, uber's minimum star rating policy can be used as a hiring/sign-up filter.

Would you consider such a thing dehumanising? Its essentially how insurance works, and is increasingly becoming a viable business MO.