We all agree that people don't post critical comments, for the vast majority of cases. Personally I base myself on the number of comments, rather than what they say. If I post an image and it gets 15 comments, and another one gets 5, I assume that people in general preferred the first one. But that's about as far as you can take it. I see tons of images in the gallery I find amazing with few comments and others I find horrible that have lots, simply because of who posted them.