The quality of discussion is around the same as it was a year ago. One thing that has changed is that the moderation system no longer functions as I expect;
- Highlight thresholds do not work. I set to 5, and I was seeing '4' rated comments. This isn't a big deal, but when there are 5x as many 4 rated comments as 5 rated comments, this is a dealbreaker--reading discussion threads is suddenly not worth the effort, and that's the only reason I'm here.
- If a comment is both rated troll and insightful, it only gets the insightful positive adjustment, not the troll. You'd think that it'd get both.
- No 'set default comment to score:N instead of score:1' option. I'm fairly close to this effect by giving(I know, this is outright absurd) a negative adjustment to positive karma, and a negative adjustment to 80-85% of new users(ie, everyone who's joined after me).
The whole point of having comment options is to filter the noise out. It's not working very well, anymore, guys.