In general I think so.  There are a myriad of reasons a provider may not want to be reviewed and that is her perrogative.

On the other hand, her desire to not have reviews is trumped, in my opinion by a bad or unsafe experience that other potential clients need to be warned about.  Rip-off, robs, upsells, no service, etc are all resaons to disregard a providers no review request.

But for me, if there was nothing that others need to be seriously warned about, I will absolutely respect a no review policy.  But I need to be asked not to write a review, if I do not ask her myself after the session is over.

In general, a good review generates interest for a provider and helps her business, so if for whatever reason (not my business why) she doesn't want to be reviewed, I respect the request, absolutely.  With the caveate that there is nothing others need to be warned about.

Sometimes a provider and client don't click (yes even with delightful and charming me this can happen) and this is very much a YMMV endeavor.  That is understood and a YMMV thing does not constitute the need to "warn" others.  It would take a real breech for me to review a provider that does not wish one.