I wouldn't expect an Uber driver to know the final destinations to my home in the suburbs, but at least the general direction. Most of my Uber journeys are stationary for a couple of minutes while the driver works out the best way to go, rather than just heading off in the general direction and turning on the sat nav at a red light.
There is also knowledge that I'd expect a professional driver to have. I recall a journey I took once where the sat nav told the driver to go through a tunnel which I knew was closed. I told him to take the bridge instead to save a big waste of time.
My point is though, you do sacrifice quality for cost. I don't agree with this article that says they are cheaper and better.