I also like the subreddits I subscribe to, and the volunteer mods generally do a great job. But I do think that HN mods (who are paid, I assume) have a more difficult job in content filtering, in that HN is ostensibly a general discussion forum. Even as it skews towards tech and startups, just about every topic is eligible for discussion, including political debate. In r/netsec, for example, submitted links and discussions are generally good, but the mods are also very strict about the content -- technical posts, only. I suspect the quality of discussion would change drastically if they allowed anything remotely political or even just non-technical, such as various Troy Hunt posts [0]
[0] https://news.ycombinator.com/item?id=16636453