I have really debated getting into this conversation, being one of the few providers around. I've been thinking about this anonymous rating issue for a while, having had just a little bit of personal experience with it.
I think there is an awful lot wrong with most of the doctor patient relationships in our current system. Not just the types of examples we all think of with docs doing things against the express will of clients, but in many small ways as well. I know there is a legitimate problem with the sort of heirarchal system we have - physicians feel that they should prescribe and order and patients should comply. Not exactly the best kind of working relationship. On the other hand, having now practiced nearly 8 years, it's fairly scary how high folks expectations are of physicians. I should get the diagnosis right every single time, on the first try; I should order enough tests that folks feel reassured that every stone was overturned, but not too many so that you get a big bill and no satisfaction; I should have perfect interpersonal skills in every interaction, and never misunderstand what someone means - and often, I should be able to interpret what someone "really wants" even though they don't tell me what that is; I should never be too busy to answer a phone call immediately at the office, I should be able to fix their problem over the phone - and while I'm doing all this I shouldn't ever be tired or crabby or whatever.
I practice in a small town where their is a very active rumor mill and it amazes me sometimes what rumors about me get back to me, or how stories are interpreted or turned around. The rumor mill is kind of like these anonymous reveiws - it's always one sided, and often blown out of proportion, and rarely totally accurate. I once had a woman whom I'd never met tell one of my own loyal clients that she would never go to me because I won't let anyone have pain medicine! (Where that came from is a complete mystery since it is of course not the least bit true, but I've actually heard it numerous times)
The thing is, I think I'm pretty good at what I do. Being a family doc is my life calling. I try very hard to practice as collaboratively as possible, and to be transparent about my thought processes (by which I mean, when there is uncertainty about the diagnosis or the treatment, or whatever, I try to make sure my client can understand why we aren't sure, what we'll watch for, how we'd know if something more serious was developing, that kind of thing.) I stay up to date on the evidence as much as I can. I just reboarded passing my exam in the 94th percentile in the nation, so I feel like I'm staying up to date as much as I can. I eat, sleep and breathe my practice much of the time - I constantly worry about missing something, about not explaining something welll, about an unanticipated outcome, about a client being disatisfied. But the fact remains that I am human, and sometimes I blow it. Sometimes it isn't possible to know exactly what to do. Sometimes, clients aren't even fully sure what they want, or actually agree to things they change their minds about later. I am just a human being with a technical skill that I share - but the way the doctor-patient relationship is in the US, being human is not always acceptable. It is rare for someone to come back and say "I wish you had done this differently." The few times they have, have usually been good growth experiences for me, and usually the relationship is salvaged, but more often folks disappear and you hear something negative about yourself that doesn't seem to reflect what actually happen.
On the one hand, I wouldn't expect folks to promise not to say anything about me online. I think there has to be some way for potential clients to know something about your style and skills. On the other hand, while this is not yet a common thing, one or two reviews can be all that you have, and a really skewed view of the provider. I practice somewhere there isn't a lot of internet savvy, so I don't know how much this will actually affect me, or my practice (which continues so far to be if anything, too busy) but let me tell you, since I feel like I'm doing the absolute best job I can and pouring so much of myself into it, it's darn discouraging to look up your only review and find out it's negative, and worse than that, inaccurate! (which just happened to me after looking up one of these sites after reading this thread!)