Poor analysis by some of the users (there are a lot of non-technical commenters on here) doesn't negate the higher degree of technical discussion that has indeed been present here. Just because opinion and fallacious arguments are present doesn't mean that good technical discussion isn't. Outside of dedicated infosec communities, I am not sure what online community has had more purely technical discussion on these issues over time. Feel free to list them though, because without sarcasm, I would be happy to know of them.
The amount of horribly bad posts on HN has reached a proportion where they're no longer exceptions, they characterize the site as a whole.
Personally I've noticed my participation drop in the last few months because of this. There are fewer and fewer people interested in engaging in a discussion, and more and more religious zealotry where it's clear poster has zero interest in opposing views, and will stoop consistently to hostility and fundamental indecency when confronted.