I've only used Uber once, out of curiosity really.
It was fine, just like a taxi, the price was a little less but not much.
I asked the driver if he liked driving for Uber and he said it was his last shift, he was going back to driving for a taxi company as he couldn't make any money driving for Uber.
As the city I live in has an over supply of taxis Uber can't exploit the customers, so it sounds like they need to exploit their drivers instead.