Where HN has been falling short (lately, in my observation) is where discussions about the ethics of certain business models get lost via the "buried" option or killed off completely.
You cannot come to HN to discuss the potentially-negative ecological or economical impact of a YC company. The voting rings will literally send your comment or post to the void: buried or killed off completely. HN does still post lots of interesting links, but for truly interesting discussion that isn't (for lack of a better word), tainted by bias, I prefer Reddit these days.