Adding positive comments doesn't usually add as much information. The story itself was a positive comment. Critical discussion is best done not by saying "hey,

Adding positive comments doesn't usually add as much information. The story itself was a positive comment. Critical discussion is best done not by saying "hey, cool story" - that's what upvoting is for. There are some cases where a non-negative comment is great, like pointing other readers to an interesting piece of related information, but if all it does is confirm what the original submission said, it's less informative.