Earlier quoted context omitted.
Indeed, though the worst trend I see is emotional comments getting voted up more. Maybe I'm seeing the past more warmly than it was, but it seems like clear, logical, consistent, coherent comments got voted up and emotional based comments stayed around 1 or got voted down. It seems like a lot of emotional reactions are getting voted up even when they're not coherent, consistent, and logical - which seems a bad trend.
The worst trend I see is comments getting downvoted based on opinions expressed within, not on how poorly they are expressed. No matter how thoughtful a comment, if it goes against the groupthink, you can expect it to hurt your karma.
http://news.ycombinator.com/item?id=117171
He is still thinking about tweaking the forum settings here to ensure good discussion. On my part, I'm a good bit more disappointed when a user asks a polite follow-up question (for example, "What would be a source I could check to confirm that fact?") and that kind of comment gets downvoted. Why do people disagree with trying to find out more information to enlighten the discussion?