I've come to the conclusion that MF reviews are good on either end of the bell curve, at least in the Chicago market. If a guy has like 80 reviews, I think it means that at the very least some people are liking it enough to write (even if some masseurs offer future discounts if you review).
Secondly, if a guy has had a profile for like 5 years and the number of reviews has stayed flat, I run away.