First the word criticism is one that I choose not to use. I do not want to find fault with someone else's opinion or style, etc. Of course, someone finding fault with my opinion or style is not welcomed either. Now if you want to give me honest feedback that is very different and I welcome that. Don't be mean and hateful. If your opinion differ from my opinion that is wonderful.....we are all different in our views, why we have those views and or why we look at the world throught different lens. If you are truly trying to be helpful but the comment has the potential for being embrassing contact me through my email and I will decided if it is something that need to be shared.
No, I am not just looking for praise, but I do like comments. I try never to read someone else work without leaving a comment. I think we each deserve that much respect.
A community like hubpages is here, I believe, to help us get our work out "there" and to be a supportive environment to allow us to grow and develop as writers.
This, by the way, is a great question.