Especially if she has your contact info.
Some guys will call me a pussy and a mangina for saying that, but in the end, this is about YOU. You don't owe anyone else anything, and if you pay for VIP, then you REALLY don't owe anyone anything. You paid for the session with your hard-earned money, and you pay for VIP, so what do you get out of some guys who are telling you to write a review? The old "thanks a lot, buddy"?
If you did your research and her face was just not up to snuff (and her face pics were blocked), that's on you. Sorry, but this shit happens from time to time, and that's not her fault. If the pics were real, but she blurred her face, and you relied on the reviews of the other guys to make your decision but were unhappy with how she looked, that's not her problem.
However, if she stretched out or airbrushed the pics in some way to completely misrepresent her figure or body, that's entirely different.
Practically speaking, if she has your info and she is unhappy with the review, she could trash you and disclose that info on a blacklist. Again, PRACTICALLY speaking, that's a hefty price to pay for the fact that you hooked up your "bros" (and I use that term very broadly because these jackholes certainly didn't pay for the session or even for your VIP).
If a guy reads this and wants to know who to avoid, he can PM you. That is, unless he doesn't pay for VIP, and therefore can't PM you, in which case he's a cheapskate looking for someone else to do the work while he gets the spoils.
Bottom line? This can be handled via PM and the backchannels as opposed to publicly destroying her. And like I said, if she wasn't what you expected and this was purely in the face, that's on you, not her.
I saw a girl in Miami who was rated mostly 9s and 10s, and she was downright ugly in the face. But I didn't write a review, because that's entirely my fault. She blurred her face, but that body was sick, and it was hers. Ultimately, I wish I had spent the $500+ elsewhere, but if I trashed her in a review because I was disappointed in her face, that would be laughable.
My two cents.
You don't pay for my VIP. You don't pay for my session. So what the fuck do I owe you?
I write plenty of reviews...at least 15 since February on my alias ALONE. If you have a question about a girl I have seen, PM me and ask me. But those reviews are plenty of information...way more than most people post, and I am certainly not adverse to sharing information with people via PM on girls I may have seen and not reviewed.
But giving out free information for the rest of the people here? Get the fuck outta here.
Brass ones? You're a tool. All the best information is shared via the backchannels and not on public reviews.
As for my "NYC Hooker Index," unlike London Rayne I actually showed my arithmetic. And if you fools believe that she or anyone else actually added up and averaged all the ads on TER, Eros, BestGFE and more, you are even stupider than I imagined, and the credibility of your reviews should also be questioned. 
For example, if she wasn't your idea of a "10" on looks, well, everyone has a type. Just because she wasn't you're cup of tea doesn't mean she's not the woman of someone else's dreams.
If her performance wasn't what you expected, look at why first. If there wasn't much connection to begin with, then you can't really expect her to wow you like there was one. Were you super quiet and reserved? Did you just plop down on the bed and sit back like she was supposed to make your day? Could she tell you weren't terribly impressed? Did you give super vague answers when she said things like "what do you like? Is there anything you've ever wanted to try?"?
I'm not trying to say you weren't a good client, but we are only half the equation. We may be "pros", but we can only work with what we're given.
... but be aware. With honesty comes the risk of drama, threats, blacklisting, and outing of your personal information. Only you know your personal situation and can decide if its worth the risk.
Just remember ... the guys urging you to write a review won't do anything to help you or even give a shit if things go badly for you.