You could answer that question for yourself by reading my comment history. A substantial portion of my last ten comments have positive sentiment, and some of the negative ones are about other negative comments (e.g. The one where some idiot floated the idea that the US will shortly go the way of post-Communist Russia). I daresay if we compare mine to yours I come off as downright cheery, not to mention largely civil.
But it is true that I don't think a piling on of "this is awesome" comments are particularly useful in the average case.
