* Uber drivers often have no idea how to get around. In my city, they're often suburbanites who have come in to drive the drinking crowd to three or four entertainment strips. Venture outside of that and they don't even know where they are.
* The worst experiences I've ever had being driven by anyone in any context have been in Uber. My theory is that because people are in their own personal cars, they feel justified driving just like they do when they're alone. Whatever the cause, I have had some truly dangerous drivers.
* I don't necessarily need or desire a complete detailed history of every ride I've ever taken. There are huge potential privacy concerns.