Here in London, every Uber driver I’ve spoken with has been very positive about their experiences. (Of course, I’m unlikely to meet drivers who don’t like Uber if I’m in an Uber!)
Amongst the compelling reasons why ex-minicab drivers tell me they moved to Uber is that they are driving an empty car for far fewer miles. Minicab drivers (unlike black cabs) are not by law allowed to pick up a fare that hails them in the street — so they will typically end up driving back to ‘base’ where their local cab office has another job for them. With Uber they’re far less likely to be driving those unpaid miles, as they can often find another fare in the vicinity.
Minicab firms here take a comparable cut of the fare, and require drivers to maintain their own car, just like Uber.
I’ve also heard drivers say that they feel more secure knowing who they are picking up, knowing that it’s attached to an Uber account and a credit card. While it by no means eliminates all risk it’s a lot more information than they would typically have for a minicab job.