its hard to define quality. can't less agree from what you said about building up relationship.
You are totally right. What is quality content? I believe that if I read something where I learn something or I see a point of view from the author, for me it's already a post worth reading. I tried to define quality content a couple of times and never managed to come up with a definition that I could really stand behind.
well, in the end I prefer to vote posts from someone I like or the post that I like, because they deliver something... which most of us do that too.
cross my finger, I hope oneday someone dare to state out what his/her variables and parameters to judge Post quality and measuing method on how much effort to make them