I get that sometimes with human drivers, when I'm lucky, I get someone who goes above and beyond, someone who's fantastic to talk to along the way, and so on.
But if I can trade all that with a guarantee that there's a consistent, predictable floor to my worst experience, I'll take it in a heartbeat.
At the end of it, I take a ride to get from point A to point B. I'd rather have a machine does it for me very efficiently, without all the messy human element, with the ups and the downs, because it's the downs that ruin my day.