I grew up using modem-based BBS chat forums. I love text chatting on forums, usually moderated. I've used (and still use) forums for glassblowing and scuba diving as well as computing chat forums. They have to be moderated to be any good.
I even came up through the internet 'rec.xyz.abc...' days so remember them rather fondly as well.
However, hosting and moderating (even with lots of good helpers) a forum these days is something that seems to call for a good-sized lottery win to be maintainable. If you can't host it yourself (your own iron, dedicated static IP) then it's a crap shoot hoping the hosting provider doesn't just abandon you at a moment's notice. A very iffy proposition at best. I host my own sites (one commercial application for a client and one for me personally) and I could not afford to pay for the bandwidth or server space for even a modest BBS type thing.
But I do love them. I do notice they all tend to be akin to those scrolling history charts that used to be popular in tv shows - where the scroll shows a particular year and what happened then moves on. IN other words, history repeats (and repeats and repeats and repeats and...) on any good chat forum. Some of the better forum software allows older chats to be archived, or pinned, or otherwise saved for future. But topics continue to resurface, usually as a new person 'discovers' what all the old timers knew years and years ago. In most of the forums I still frequent, there's a lot of generous knowledge transfer to the new person and often real encouragement. Abusers are flagged and 'disposed of' in most of these systems as well, keeping the general tone very pleasant.
I don't find google groups to be horrible. It's not great - a lot of repeat same topics, but unless someone is going to moderate, then getting (for example) a single "show us your build" threads just aren't going to happen. We get too excited when the build is done, and rather than hijack someone elses' older 'see my kit' thread, we start our own. It's not really all that bad for the most part -- except when you want to look up something you kinda remember but can't quite recall. The search function seems to be far too generic, often flagging hundreds of posts that have to be waded through. A 'search within results' would be nice.
Anyway, that's about it for now...