What really is the point of the review system?

[SteveB]

"Opted out of reviews" is a sort of negative review that a girl gives herself.
There can be genuine reasons why people opt out other than that she has got one or more negatives, but I still regard opt-outs with suspicion.
As well as giving other people’s opinions, reviews, I think, tend to “keep people honest”. If you go to someone who doesn’t allow reviews, if she is only in the area for a few days, what is to prevent them from giving mediocre service? I know many people who have opted-out give good service, but if I haven’t seen them before, that is always on my mind.