OTOH a lot of legitimate questions were answered by specialists or people very familiar with the subjects
Generally, I find Quora to be a pretty "ok" place to have a conversation. Better than most of Reddit, for sure. (Reddit does have some fantabulous subs to be sure, but not very many! :-) )
EDIT: HN is good for conversations in threads, although they can veer off track pretty wildly. Reddit can get pretty vitriolic. You could have a conversation, but the participants destroy it. Twitter? Fuggedaboutit. Are there sites I ought to look at where I can have a polite discussion with people that I may or may not agree with on various topics? [FWIW - Before 2008, Reddit itself was pretty close to this, except for maybe /r/politics]
I only go there to read a few people's opinions on things. If you restrict yourself to those people then Quora seems ok. If a Quora link shows up in my search results -- I know it's going to be useless.
The only problem is Quora seems to aggressively promote clickbait scammers / self-promoting twits. I find myself actively logging on to Quora very rarely these days as it becomes harder and harder to repel useless content from my feed.
I just don't click Quora links anymore.