1script - 2:54 pm on Jun 3, 2013 (gmt 0)
Why do you say that? It looks like JohnMu had taken some time to browse your site before posting, so you would think he'd recognize the forum format. At least that was my impression. Articles and blogs (except for comments section) are the antithesis of UGC, so it would be hard to think of one thing and give you an advice on something opposite. In any case, forums and forum-like sites are particularly susceptible to poor content quality, so whatever he was talking about (and the entire conversation around Panda issues) is very much applicable to forums.
My guess: The advice we're getting is meant for 'article' sites / blogs - that's why it's just not 'adding up'.
That said, my own forums sites haven't been affected by any of the official Panda runs. This makes me think that Google did recognize the particular challenges forums face in terms of low quality UGC and has been giving us a pass up until Panda 21.5 at which point they seem to have made a "correction" of sorts to level the field between different types of sites.
I would hypothesize that the improvements in UGC quality (more accurately improvements in the quality of pages with UGC) that you and I are making now might only make any difference at the time of the next "correction", which seems to be a very rare and unpredictable (and unannounced) event.