I will admit that my knowledge of SA and its environment and culture is limited, but nothing I've seen would cause me to think of them as particularly "high quality".

I haven't read the SA forums regularly in a while, but AFAIK they're like Reddit: the good stuff's tucked away in (some of) the lower traffic specialist subforums, while the more popular, general subforums naturally lie at the lowest common denominator level because of the sheer number of people reading & posting.