Centralised forums aren't ideal. Some people love the idea. For me on Reddit, as soon as you say something someone doesn't like, the instinct to go hunting for a witty personal attack comes to their mind.. they go through your profile find that you like, oh I don't know, gardening? Next thing they're telling you to 'take the pot off your head' or something like that.
Dedicated forums have been best, alright so MR has poor moderation but Reddit definitely has worse. Car forums, tech forums, bike forum, food forum etc, are all full of people really passionate about their hobbies etc. I never could take to Reddit.