I'm not sure how many guys see escorts for the same reasons I do, and seek similar things, but speaking for myself, the amount of reviews isn't as important to me as recent reviews. If there are many reviews but nothing new posted for over a year, I'd pass. Lots of old reviews over a period of time, a two year break and then 3 new ones. Cool.
Positive reviews are a must for me. The reasons I p4p are A) to see women who are younger, and physically more attractive than what I can pull off Bumble or Match.com B) to make appointments to have my fun when I want to make time to fit it into my schedule, and on my terms so to speak, and C) because I can be specific. In real life, I get girls that I make connections with, not the model types who I'd pick out specifically for lust. I like the idea of searching for ladies with D, or DDs and a specific look for example that dress to attract men and arouse men. If I fancy a woman and I'm willing to provide the donation, I can have her. That's addicting.
The reviews to me, simply let me know if they look like their photos. If the incall was safe and not at some scketchy apartment complex in a questionable neighborhood. That the provider was pleasant and personable, not all business, rude or in a rush and mechanical. They let me know if communicating with her was difficult and flaky or not.
The amount of reviews someone has written is not relevant to me. The way the person writes the reviews is also not relevant to me. I simply comb thru reviews for the tid bits that are relevant to me. I personally don't care about the play by play account of how the guy physically reached his orgasm. It's often difficult to suffer thru long paragraphs of a guys poorly written play by play, reading all the different terms men use to name their penises, just to find out what I'm looking for. I could care less how she grabbed his "captain" and whether or not she pays attention to "the boys."
As long as her reviews paint her as a pleasant person, who's photos are accurate, who offers a safe incall location and has seen a few guys recently to vouch for that, I'm good to go.