Dear Prospective Reviewees, As I look through posts to review, I notice that many of the posts are in genres I rarely read : Sci-fi, Fantasy, YA. (It does make me think I need to expand my horizons a bit.) Moreover, I question whether it would be useful, or not, for me to critique in such a genre. It might give a fresh perspective, or you might be frustrated that I don't understand your genre. Is there a general guideline here?