edit: they're also talking about retaliatory ratings "if you give me a 1 I'll go back and change you to a 1 and you'll have a hard time getting picked up again", I thought that wasn't possible? Did Uber change that?
Not sure about on the driver side, but on the passenger side you could log into the desktop website & modify ratings for a previous ride. Was useful when a driver forced you to give 5 stars, you could revise it once you got back to your laptop.
Uber quality has improved in my city a lot since then though, at least for me. And I've personally had far worse experiences from regular taxis in the past[2], so I'm still a fan of Uber.
[1] https://twitter.com/syneryder/statuses/756130867269873664
[2] https://web.archive.org/web/20170816073734/https://www.msn.c...