"Uber driving sucks"
More generally I'd say that "performance driven" work sucks, especially when the thing you're supposed to perform is nickel & dime stuff.
Performance driven work with a large baseline in your comfort zone is another matter, assuming that baseline is really guaranteed, but increasingly we're seeing even menial jobs being tied to performance, with a baseline (and a realistically achievable target) that's barely equal to minimum wage.
The "service economy" in reality translates to minimum wage drones in call centres, or in this case driving cabs.
I'd still like to see a detailed analysis of the practical differences between being an independent taxi driver and being an Uber driver, and in particular the actual (not "potential") profits.