Beyond the contribution it provides to the site and to other hobbyists who may read it, what, if any, benefit is provided to me by writing a review?
I had my first visit with a provider and I am wondering if I should be writing a review. It sounds as though I am required to be rather explicit in m review which is not my style, for starters. Additionally, if I were to write a review, I would want it to be honest and I would have some not so flattering things to say about the provider, again, not my style. (Very nice girl, but the cats are travelling with her and they did not add to the hotel room ambiance, that's for sure.) I could leave some details out but that would be a disservice to the next potential hobbyist. Thoughts? Suggestions?To extend their vip membership.
But if it's not your style don't. Some guys don't have their review go through because it wasn't gritty enough. Others over embellish so it will be accepted.
As for the cats, she should have mentioned it especially because some people have allergies. If she did not and you write a review then it's fine.
Some reviewers seem to think that in order to be honest, they have to be brutally honest. I don't think that's necessary.
If you write a review, certainly be honest but try to do so in a way that respects the feelings of the provider.
As for being explicit... as you gain experience writing reviews here you'll learn how much detail you need to give to get the review published and be useful to others, while being consistent with your style. It's possible to find that happy medium, but it can take some work to meet TER's expectations while not being more explicit than you're comfortable with.
And if it were me, I'd mention the cats. 😺😺😺
before deciding to see her? If so, then maybe you should consider giving back to the community to help others. As previous posters have said, you can choose your words carefully to meet your tastes.
Here are a couple of the positives. Reviewers do tend to have more credibility here, I am one of the few exceptions to that rule, but I've been here a LONG LONG time. You do get a couple of weeks worth of VIP for each review, hardly worth a LOT of money, but it is what it is. There is also the fact that you are giving back to the community which is a positive and of course the fact that some providers will read your reviews to get a sense of your likes and dislikes which can lead to better sessions.
Here are a couple of the negatives, Yes you are REQUIRED to be very explicit or you are simply wasting your time writing a review as you won't ever get it approved. Negative reviews can have blow back from not just the provider you write the review about, but from other providers who actively "manage" their reviews. There is also the "very slim" chance your reviews could be used against you someday, but most of us will agree that risk in negligible.
Now a couple of things to consider, if you are going to write reviews, be honest. Lies, even "lies of omission" undo all the positives you are trying to accomplish by writing reviews. You said it yourself. Leaving details out would most definitely be a disservice to the next guy that books with her. You might consider writing your reviews under an alias and using your handle for the discussion boards, just remember that to protect your anonymity don't leave too many breadcrumbs for the women you review to figure out who you are.
What ever you decide I am sure will be the right decision for you. Your thought process on the subject seems to be spot on for some who just started this.
... to get a review published. Perhaps if GaG had written some reviews in the past few years he'd know that. 
("You" below is addressed to the OP)
What IS required by TER is to substantiate in the review text any performance points above 7. For example, if the session included kissing with tongue and a bareback blow job, and it was just you and the provider, you could give a performance score as high as 9 (doesn't have to be 9, but CAN be if you believe it's deserved). That can be done as simply as using acronyms like LFK (or DFK) and BBBJ, or describe what happened some other way that's clear to whomever approves the review.
Of course, if you don't want to give the provider a performance score above 7, or she simply can't qualify for a score over 7 based on what happened in your session with her, the paragraph above doesn't apply.
I know that there's guidance from TER to be "explicit". So there must be some amount of detail to describe what happened. But I've seen many reviews published with little detail in them. And in many reviews, it's clear to me that the author is trying not to "kiss and tell" everything that happened in great detail, as it's not their style.
As I said in my post above, it may take you a few tries but you'll learn as you write some reviews how explicit--or not--they need to be to get published. Those of us who've actually written a number of reviews in recent years, including under the current rules, are in a better position to advise you on that than someone without such experience, IMO.
GaG & the others have summed it up well.
You can always write a review, save it as a draft and sit on it for a few days. Write what your comfortable with and see if it's accepted. There's always the "we were so busy having fun that I can't remember exactly what happened", followed by a description of the session. The alphabet soup may seem crass, but it's helpful if it's honest. Do mention the cats. I find the description of the start really helpful. Was she warm & welcoming, dazed & confused, tentative, did she jump your bones, etc.
Don't make stuff up. (Guys do - that's one of the biggest complaints I've heard from providers.)
I use my hobby email to save a draft of my review. You must link a current ad so you don't want to wait until her ad disappears. That said a review can be submitted up to 90 days after so waiting a week or 2 protects you from provider back lash if she's unhappy and/or you can write the review under an alias.
Reviews can be written without being overly explicit. If it's not approved, you can edit it & resubmit.
If you read some of my reviews, you can see that I tell the story so that there is no doubt what happened between myself and the provider without the use of extremely explicit language. You can use acronyms to get the job done.
Writing the review is a benefit to her future clients, especially if you had a good experience with her. If your experience with her was not so good, it will let guys know she is someone to be avoided.
Above all, if you are going to write it, be honest.
LLAP,
Swim