[kelnos]

Yes, I also believe that, in the US at least, the social pressure distorts the signal that the tip sends so it's meaningless. There is such a huge stigma associated with not tipping (or tipping poorly), that most people will tip a decent amount even for poor service.

Granted, the rating system is no better, even if for different reasons: since Uber/Lyft will deactivate drivers if their rating falls below what I'd consider to be a fairly high value (something above 4), most people (where I live, at least) give 5 stars unless there was something seriously wrong with the ride, so a mediocre driver will get the same rating as an exemplary driver.