Ernest Lilley clarifies his position on positive and negative reviews:
The only thing that we really try not to do is to run reviews where the reviewer rants from one end to the other and whose main objective seems to be to get even with an author for making them read a book they didn’t enjoy. My frequent comment to reviewers is that if it doesn’t grab you, put it down and we’ll get you another. On the other hand, if a book has flaws as well as strengths (and what doesn’t?) folks are welcome to point them out. Of course, what one person sees as a flaw may be another person’s strengths. Handled well, for instance, I like a bit of exposition in my fiction, and if a story doesn’t include new ideas I’m less likely to think well of it. I like plot too. For other reviewers though, the prose is the thing, and infodumps just get in way. I don’t think either is right or wrong, and part of the editorial job (handled ably and more often by Gayle Surrette than me) is to match book and reviewer.