The problem is, I am picky where it comes to appearance, especially where it comes to age and weight. A guy could have a GREAT time with a 45 year old BBW, and even give her a ten for performance, but if I saw the same woman, I doubt I could even get aroused enough to have sex at all, much less have a  "great" time.

No, there are literally thousands of women with nines for performance that I wouldn't fuck on a bet.

I think if you make what seems like a personal connection with the provider, you might feel a little obligated to give her a higher rating as a favor. Sometimes you have to read between the lines a little as you read the content. Sometimes you see a girl rated 6/6 which to me sounds like a dud but then you read the content and its good.

Appearance, Attitude, Maturity, all play a part. I will grant you that it is a high probability, but not guaranteed.

In this little world. I pay very little attention to the numerical scores. I read the reviews and look for a reviewer that I know and trust  

Why? Because it takes two to tango, as they say  

I would say a provider who has mostly 9's and 10's tells you one thing: she enjoys her work and she puts a lot of effort into appointments. For me, I'm low volume (I know this means different things for different people) in the sense that I would never take so many appointments that I would be physically exhausted or not at my best. I put as much effort as I can into making the appointment special and make the client happy. Providers are humans too and sometimes we have worries or stresses in real life that we have to try and put aside but it could still affect performance, I suppose.

This is a unique business because it is so personal. I've had clients that I didn't click with for whatever reason. Other times gentleman have shown up dirty and refused to shower. I had a gentleman once book me for an outcall and then was forty- five minutes late. I actually left because I was so angry that there was no way I could possibly do my best. There are certainly challenges at times.  

I think being respectful to the provider and reading her website, especially the etiquette portion is the best way to increase your chances of having a great time.

9 is easily achieve by just doing the basic in accordance with TER Guidelines...seems to me you are one of those guys just want to guarantee get your moneys worth, stick your googlystick at any holes not considering the appearance of who's letting you plug them...Without the looks no boner for me...I'm not particularly interested on the performance side, I'm more turned on on the looks side and always take my chances from there...

I once met a lady who had straight tens on over 50 reviews, service, and looks. What can I say? The session was awkward. I didn't want to be the one to break the string, so I simply never returned. I once met a lady who had all nines and tens on her reviews, looks, and service. She didn't show.  

Consequently, I once took a chance on a lady who had mixed reviews, including and handful of sevens, and a six. We hit it off, and always wanted me to stay an hour or two overtime. We used to trade emails in the middle of the night.  

Reviews are a great idea, and always helpful, but only to a certain extent. A 9 or better generally means a great time, but once can never be sure unless you walk through door.

For reasons that GaGambler stated as well as the simple fact that everybody is different, everyday is different, etc., there is no such thing as a guaranty.

It takes two to tango.
Even a perfect 10/10 can only do so much if the other consenting adult lacks bedroom savvy or is simply despicable .
Mutual skills , considerate attitude , and grooming help the lady give ya that 9 or 10 performance.

rather read the reviews and see if her menu clicks with your expectations and then check her website to see if her pics get you aroused.

I disagree.

I personally don't have chemistry with every client I meet, some client as soon as he comes in, I know we gonna be a perfect match and going to have a great time others, but with another client sometimes I can't wait to get the date over with because our personalities just don't mesh.

There are no guarantees. Especially if there are only a few reviews. But if you look for established providers reviewed by established reviewers you can come close.  

I saw a provider that got a horrible review and then bounced back with a 10 10. But if you look at her years of reviews, you will see a pattern of bounce back reviews by reviewers with one or two reviews. That should raise some red flags.

I don't think that there is such a thing as a guaranteed good time. There are so many factors that come into play. Chemistry between the provider and yourself is one factor. The happenings of the day can be another factor. I know most providers attempt to never let their personal lives interfere with their performance with the friends they spend time with. But we are only human, and not perfect. That being said, the goings on of your day can affect how you interact with the provider as well, and change the outcome of the visit. Also, everyone does not want the same thing, so you cannot base your experience on someone else's. It will surely vary.  
I just think people should accept that we try (or most do) our very best to provide you with an unforgettable, sensual experience that makes you remember us fondly, and hopefully want to return. Aside from that, there are no guarantees that what she finds is her best, equals to your 9 or 10 review.

Scores are only part of the research...  and number scores are much less useful than the written description.  There is also the images, if she appeals to you.  Also depends on your preferances.    

I've had great times with gals who would not have gotten high ratings but they were what I wanted.  (I couldn't review because of where the ads were.)

As there is no agreed scale for the use in reviews the difference between each number is actually irrelevant. The difference between a 9 and a 10 is irrelevant unless you know whether one reviewer feels they would only score a 10 for a life-changing meeting which they never expect to occur while another might be quite happy to award 10s for every enjoyable meeting (like two different sets of exams in college, in a mathematics paper you can answer every question correctly and get 100% while if the exam consists of an essay it doesn't matter how good an essay you write you will never score 100%)

Of I see a lady has received scores of 8, 9 or 10 I will be likely to want to see her, even though I know that the full test of the enjoyment of the meeting will ultimately depend on many factors totally unique to our meeting, it's only very low scores which would put me of

A 9 on performance tells me that a provider was enthusiastic and made the effort to satisfy her client.
Multiple 9s would indicate to me that she is adaptable, and is able to create a certain chemistry with a variety of people.

This does not guarantee a good time, but it's a start.  After looking at the scores, I would read the reviews.  Think about the style of session you like and check if any of her reviews are similar.  Some girls have a variety in their reviews, from snuggly GFE to PSE-like experiences.  Again this speaks to their adaptability and increases the chances that you will get the session you want.

Don't forget looks!  If you have a type, it's probably best to stick with it.  Don't think that performance will trump looks, chances are it will not.  I once had a client who was into 20-something spinners, but he was blown away by my reviews so decided to see me (late 30's, tall, average build).  I'd love to say that my skills won him over, but I simply was not his type physically and that was really important to his overall experience.

So look at those scores, but read reviews and look at the photos!  Then make your decision

Some guys rate every lady they see with 9's and 10's. Who knows...maybe they actually are (in their opinion)? But amazing girls also can and DO have "off" days. And what if she has excellent reviews, but you just feel no chemistry with her? 9's and 10's are not a guaranteed good time, long story short. Just my opinion.

There are girls out there that tell clients NOT to review them unless it's a 10/10. My lips are sealed, but a couple of my clients have told me they've seen girls with these "policies". It's bullshit but it happens.