From https://news.ycombinator.com/newsguidelines.html:

> Please don't post comments saying that HN is turning into Reddit. It's a semi-noob illusion, as old as the hills.

That said, I've been on HN for over 10 years. There does seem to be a slight increase in low quality / low effort comments as of late. That's probably a function of moderation than anything else. The average number of comments on posts have been growing steadily, and I suspect it's getting harder to moderate.