Ficbot, I like your suggestion that reviewers should include constructive criticism with their reviews where applicable. That's one of the things I've griped about for a while with reviews. If there was something you didn't like, or something that you felt needed work, by all means tell me. I'm not afraid of a bad review so long as I can learn something from it. I had to actually beg one reviewer who gave me a scathing 1 star to explain their motives behind it. Finally they relented and revealed that the only reason they hated it was because it was "unrealistic". I really laughed hard on that one, because the unrealism they were talking about was things like warp drive, shields, etc. That's what Sci-fi is! lol.
But anyways, I'd be all for Simon's idea if we can make it as fair and balanced as possible. That includes knocking reviewers off the list who turn out to be less than reputable.