If two's the limit, perhaps 'positive' and 'negative' are not the most helpful adjectives to describe the comments readers leave for our stories. I have never seen a comment here that could be described as wholly negative. Mostly everyone's really gentle and sweet (funny, that).
A comment is an opinion, to which the reader is entitled; the writer can take it how they choose, but of course we love approbation.

Comments are fun to read - the best ones add something to the text: an unusual perception, a joke, a snippet of information. Mati's, for example, I think are often brilliant.
Comments tend to be on either Content or Style, with many including both. Style comments require more knowledge of the writing process, and some readers don't feel confident to make those on a story; indeed, some readers don't care how it's written so long as the spankings are upfront, long and hard.
We are a broad church: some are up with the bats in the belfry, some in the dark of the crypt, and others prostrate at the bottom of the altar ... or perhaps that should be ...
