This is not going to be a popular reply, but I feel much the same way as Jenks. For some reason, either cultural, technological or perhaps because of membership the dialogues here are very reductive and flat - perhaps this an inherent characteristic or fate of online platforms.
The reading thread seldom moves beyond 'is it good?' or 'is it bad?' The forum is increasingly mired in simplistic narrative: the calls for yea or nay, the combative 'convince me', arms folded, the apathetic sarcastic responses offered by some. It is operating at Twitter level. Count the characters.
And, for me at least, after putting in the effort to be generous and type out thoughts on a topic, the posts get shot down as elitist or snooty.
If you expect dialogue and articulated opinion on subjects like painting, politics and literature you're going to have to build an environment that is conducive for those responses and move beyond the immediate clicky-clique mode of YES/NO/LIKE.