It's also fair to say that the cracks are bigger (or, to be generous, an unknown width) with a non-regulated serviceNo, that's not a fair assessment at all - the evidence doesn't bear that out. Just because the government isn't doing the regulating doesn't mean there is no regulation. Uber at the very least does background/license checks, and the aforementioned ongoing quality rating. It's not a free-for-all.
There's also an article[1] straight from the horse's mouth about a statistically-significant reduction in taxi crime in Chicago after Uber set up shop there. Obvious bias, but I don't see anything obviously bad with their data.
Every taxi I've been in has a number to call, commonly mandated and staffed by a public agency (whose records are therefore public), when you have a problem.
As previously mentioned, a complaint based model will necessarily be less accurate than an automatic or passive rating model - people will in general not take action to complain unless they both had an awful experience and have the time to do so. I get the feeling that the response to this will be "a bad rating does not ensure action" - but neither does a call to the public agency.
If I complain about too many taxi drivers, every other taxi driver will still pick me up.
Does Uber actually do this? They rate you immediately at drop off, presumably before you rate them. (I never got the rating prompt until after the driver had left)
How does the driver know of the history of your ratings of other drivers?
If there's short term construction, or a particular corridor is always busy at an unusual time of day, my driver will already know about it, because there's a good chance he's been driving in this city for years.
Who the heck do you think most Uber drivers are? Taking a shot in the dark here, but probably residents of the city they drive in.
..And if he hasn't, the competition to become a driver is fierce enough that he is highly motivated to be the best taxi driver he can be.
What do you think will happen to the ratings of a slow driver who makes someone late to their destination, or drives with a dirty car, or has a bad attitude? I'm going to take another shot in the dark here, but knowing what I know of the rating system, I'd wager that will get a driver drummed out of Uber a lot faster than the same behavior would get a driver dismissed from a regular taxi outfit.
I really do not get this argument - the feedback and ongoing quality checks by the rideshare companies is necessarily more immediate and more tied to actual everyday conditions and performance than the spot checks that can be performed by even the most scrupulous and well intentioned government agency.
Everything else you said was varying degrees of spot on.
[1]: http://blog.uber.com/chicagotaxicrime