A good way to encourage constructive criticism would be to have a reputation system implemented. Anyone that is willing to take the time should be rewarded and recognized for their contribution. I suppose it is arguable whether or not a reputation system would fundamentally encourage guidance and not just create an alternate reason. Surely people should already desire to contribute. I wouldn't want to get away from that, but I still feel strongly enough about it as a means of recognizing great contributors. Thoughts?