I know pg is constantly tweaking the comments algorithms, so perhaps this is why lately I've noticed very few comments with more than 5 or so karma points. Many months/years ago, you'd come to the comments and there's be a couple really great comments at the top. So much so that it I didn't need to read the article.
Lately however, I've noticed that the top comments all have one or maybe two karma points. Sometimes I can scroll down and find a comment with 30+ points, but the ones above it are one liners and not really interesting. Overall, the comments have become less interesting.
It's like a lot of barking dogs, short quips, lack of insight. The commenters seem like they don't want to add value, but rather, want to get their username on the board or something.