I'm afraid I tend to avoid reviewing a story if;

a: It is not what I enjoy. If a story has elements I do not care for, I will not review it. I would rate it lower than it might deserve just because it is not my prefered "kink"

b: I tend to follow the "tar baby" rule. "If ya can't say sumpt'n nice. don't say nuttin at all" I have reviewed stories I do like and made comments on stories where I like the theme, but the writing leaves something to be desired, but I tend to avoid leaving negative reviews.

Just my 2¢