Quality content is very subjective. I like it when people K.I.S.S - Keep it simple and sweet. Anything that does not arrest my attention in the first few seconds do not get read. I also leave when I have to ask myself, what is his point?
Some posts come to a page, when it could be summed up in a paragraph. Some might think those are quality posts. I do not agree. Of course, there are exceptions, like when explanations and elaborations are needed. That is okay.