I have no idea why this would be difficult for you to understand. Many good reviews are indeed shared via PM. From reading the posted reviews you should be able to identify members who share the same tastes as you, then it's just a matter of approaching them.
As an aside, I'm pretty terse with the 4-1-1 I provide people when they ping me by PM, I figured I was doing something wrong. Of course, my reviews tend to be pretty detailed, everything I have to say goes up for public consumption