I've commented on this in the past, so just reiterating highlights:
* We created our forum because of the moderation on this website (avsforum.com) back in 2012. It has probably changed since then to some degree, I don't know and don't follow it. What we needed is a knowledge base area with a search capability for relevant information to users. My goal was not to setup a "community", it is and was to extend the knowledge base and have as near to 0% cruft/bloviation as possible. Nothing is more annoying to me as a user than paging through 800 pages of text to find the one line I needed. If someone wants a Bazaar like that, there are countless forums like this one to post on (which all have their own moderation rules).
* Over the years, since I do from time to time hear from users on the topic, I have reviewed third-party websites for best practices. I don't see any really good examples out there of something better. I'm open to suggestion if someone shows me something that consistently works great as a corporate forum. Remember the whole point is to help users quickly find necessary information – anything else is comparatively irrelevant. Since our forum has always been moderated, the ability to search it to find relevant information is high and fast. Anything remotely support-related is redirected to support. It's pointless to try to conduct support in a forum environment without the diagnostics and other tools necessary to do it properly. That represents almost entirely what gets moderated down.
* What I see in less moderated forums are flame wars, personal attacks, threads that get shut down and then deleted, etc. You may see such things here, but never on our forum. I think that's a plus for everyone. Some companies hope they don't have to moderate and it turns out to be a complete disaster and then they moderate like crazy and think they "fixed" it until the next time – just the last few months have produced numerous forum disasters for well-known companies in this area. Our focus is and should be 100% on the product and helping users with said product. One can either have explicit pre-process moderation like we do, post-process moderation like avsforum, or silent moderation like Facebook where things just get silently "hidden" if not appropriate. The Facebook path doesn't provide good search capability or topics right now, so despite having to reiterate that we moderate things every so often, the traditional forum with pre-process moderation works well for us. Users that want a Bazaar instead certainly also have many options.