I see your point, but I’m not sure how else to describe it.

Every time I visit HN I read something interesting. I can’t remember the last time I read something that interested me on Reddit, outside of /r/space.

I mean, I know it sounded arrogant to say I was the most knowledgeable, it simply happens to be true, but it only applies to Reddit. It’s extremely rare that I feel like that anywhere else, even Facebook is much better in that regard.

Maybe I’m just using Reddit wrong, but it hasn’t always been like this either.

I agree with you. Most discussions I see on reddit are dumb. Maybe it's because it's popularity means more uneducated people are going to the site, resulting in lower quality of discussion. Also anonymity means people aren't as afraid to sound dumb in their comments compared to facebook. I see better discussion on facebook probably because most of my friends have gone through higher education.