When I'm writing reviews over on Goodreads (which, like just about everything else, I don't do as often as I should) I try to keep in mind that what I think is just that: what I think, subjective and based on my own experience rather than solely on what's in the book itself. I realize that not everyone else does this, and mostly, I try to brush it off, but sometimes? Sometimes it bothers me.
Something similar came up recently over on the EC Ning. And it left me wondering: what criteria do people use for determining literary merit or value?