They still do, and the quality of discourse on Slashdot is about as bad as it has ever been.
To this day, I prefer Slashdot's summaries over headline-only aggregators, and I wish other sites would adopt features like the mod-with-reason and karma caps per comment. But they designed the system to limit the power of moderators, and those limits didn't scale with the imbalance between trolls and good-faith posters
Considering the amount of fuckery people engaged on during the site's heyday its moderation system handled things amazingly well. If you read at a threshold of +1 you'd barely see all the garbage posted there.