There is still, occasionally, a relevant technical article (that's not primarily opinion) or link to a new open source project that is relevant to my interests.
But that seems to be around %2-4 of the content.
HN is crowded out with submissions that are designed primarily to be excuses to be outraged at anyone who believes in intellectual property, or that isn't a leftist, with the occasional outrage at violations of privacy thrown in.
And you certainly can't have a good discussion on those articles-- haters going to hate, and leftists hate private property and fandroids hate apple.
This is the fourth time I've seen this happen.
The first was slashdot, which by 2002 or so, was so overrun with GPL fascists that you couldn't say anything short of the party line, less it be downvoted to oblivion. Then Digg which gave so much power to early users that it was pointless to even try. Then Reddit which has its general /r/politics subreddit-- which everyone is subscribe to by default- with a moderation policy that bans anyone who doesn't toe the leftist line well enough to goose step. And now Hacker News.
Once I did an experiment. There was an article where I didn't like the outcome, along with most of HN, but the principle involved, a greater principle, one that most on HN claim to espouse, was being violated. I posted a comment noting that I didn't like the outcome, naming the principle, noting that most of us agree with that principle, and then showing how upholding that principle (eg: not being a hypocrite) required us to temper our outrage. I got downvoted to oblivion (which on HN helpfully means your post fades into the background making it impossible to read, which I find hilarious- we're not just going to put you at the bottom of the page, we're going to make it impossible for those who are broad minded enough to scroll down to even read it.)
So, despite agreeing with the majority, clearly explaining my position, and why I hated having to reach that conclusion, what the principle was, and why we all generally agree with that principle... I was still downvoted, because I wasn't making a post agreeing with the party line.
That's the point when I accepted that moderation is broken, and Hacker News is not a place where good discussion can happen reliably.
I think human curation has failed. Ideological downvotes have killed the signal to noise ratio of all four of these sites.