It's impossible to generalize. For lower than usual scores, there are a few guys out there who seem to enjoy underscoring. When I see Poppy get a 7 for appearance, or Trinity get a 6 for performance, and then I read the text and it is just as glowing as all their other reviews, I think the guy is an asshole. Especially if I look at his history and see he consistently scores low. Refusing to give a 10 is one thing. Giving a 6 when the text says she got you off twice and "blew your mind" is something else entirely.
But often you read the text and it makes it clear there was a reason for the lower score, even if it just means she had one bad day. I'll take that at face value, though one of those probably won't stop me from seeing her.
Two or more lower scores back-to-back is cause for concern.
Higher than average scores I chalk up to the subjective nature of scoring. Writing a review while the testosterone is still humming will do that. Writing a review of the first woman ever to grace you with her favor is hard to do objectively. I can think of at least one score I have given that, with the passage of time, I wouldn't give again, though it's not far out enough to bother changing. Or, you know, maybe they just really connected and she deserved that score from that guy on that day.
Where it gets really confusing is when a lady consistently gets both 8/9s and 5/3s. There's a touring lady in town with that kind of history. I don't know what it means, but it sure kills any desire to meet her.
Those are my thoughts.