Do you review every provider you meet?
If not, when does a provider earn a review?
Early on, I wrote reviews on almost every provider that I visited. After a year or so, that habit tapered off rapidly. For the last 3-4 years I probably review 40%. There are many reasons not to write a review...too many to list here. For instance, I recently visited a lady from your neck of the woods that asked me not to write a review. She didn't want the exposure. And since my review would have looked just like the ones she already had, there really was no need.
Nowadays I mostly write them if I feel like the lady would benefit from the exposure. If I have an extremely, over-the-top good time, I review. Or if I feel like the session was lacking or the lady is misrepresenting herself I will report that in a review.
Maybe we can try over the top this weekend 
Yes, I write reviews on almost everyone that I visit unless there are already to many on that provider. I think its important to keep the readers up-to-date with the lastest info. specially if there are only five or less reviews to read.
like the first gent said, used to post on every gal i saw, then, got involved with a local board and the gals didnt like the graphic reviews, and i wasnt that comfy writing them either
nowdays, if a gal asks, and if the time merits, i would write one here if she rocked my world
I always ask the lady if she prefers reviews or not and then I'll post a review.
I do not review all those I see. I leave it up to the provider. If she wants a review I write one and if she would rather not have one then I don't. If I'm ripped off I will write one for other's benefit.