Welcome to the wacky world of TER Reviews!  Much of what you say is so, except that BBBJ is not worth an extra point in the maximum available score.  Of course many of us enjoy 10-like experiences but cannot score higher than the allowed max.  
.
What we've got is what TER gives us, despite numerous requests for changes and excellent suggestions for improvements.  I have repeatedly suggested the X-out-of-Y scoring system as I think it would be very easy to implement w/o the need for a lot of reprogramming of the GUI or the database.  
.
Basically, services offered and accepted determine the objective MAXIMUM = Y score.  The reviewer's opinion of the experience determines the subjective X score. I have had many FANTASTIC 7-out-of-7 experiences that can be much better than a 7-out-of-10 experience.  
.
You can't search the boards (Newbie, General, Suggestion and Policy) for "X-out-of-Y". You can search "scoring system" [all these words], mostly on S&P, and you will get MANY threads discussing the review and scoring system.  (Below, I added author = impposter to reduce the list, but read entire threads for other opinions.)
.
S&P: http://www.theeroticreview.com/discussion_boards/searchMessagesResults.asp?FromPost=1&MessageID=&BoardID=4&Search=scoring+system&SearchType=1&Author=impposter
.
Newbie: http://www.theeroticreview.com/discussion_boards/searchMessagesResults.asp?FromPost=1&MessageID=&BoardID=33&Search=scoring+system&SearchType=1&Author=impposter
.
General: http://www.theeroticreview.com/discussion_boards/searchMessagesResults.asp?FromPost=1&MessageID=&BoardID=12&Search=scoring+system&SearchType=1&Author=impposter
.
Hay! TER! Why not conduct a poll on "X-out-of-Y" or just switch to "X-out-of-Y" (as it would be easy to go back to plain X by just editing what numbers to display)?  THANK YOU.

Yeah the X-out-of-Y system makes sense, though even that seems overly complicated. Users can easily tell from other reviews or the provider's profile whether they offer certain services. The nature of reviews is that they are subjective - that's to be expected. My 10 may not be your 10, but overall the aggregate number will tell you whether a provider has an excellent reputation or a less-than-stellar one.  

I'm sure this has all been debated before but it does seem odd that one person's opinion of a provider would be somehow docked points just because they didn't do X, Y and Z.

Really bi?   How am I supposed to know?

 
I think TER should just let people use their best judgement about the performance score, same as the looks score.

 
We have their menu, and the reviews for the rest.

...to a subjective experience is quite difficult, as we're seeing in the ongoing angst about the review system and recent changes.

I love Monet but HE thinks Chagall is the shit; Italian food is my go to but she wants Korean BBQ; and everybody thinks they are the ultimate arbiter of good taste and the ultimate experience.

You see the inherent impossibility in trying to achieve this?  

So use the numbers as a rough indicator but DO YOUR RESEARCH in reading reviews, her personal website, her presence on the boards, back channel communications with reviewers -- and make your own decision.

Buena suerte!

just go with the scores. Same thing applies to the provider's profile. If all or most of the reviews say BBBJ and the profile says CBJ, I will PM several reviewers to get clarification.

of a potential date.  I always read the full reviews back a page or 2 (depending on what I find).  The number scores aren't close to showing the full picture... and don't necessarily align with a client's interests either.