I think there is more POSITIVE interaction here, in the Q & A than in the forums. And frankly, what passes for "interaction" in the forums (perhaps I got involved in the wrong forums, of course) tends to degenerate into mean-spirited, incoherent zoos.
I don't forum as much as I used to when I first joined HubPages four months ago. But there is one hubber, a guy called pburger, who hosted forums that I always enjoyed participating in. But it doesn't seem he's been around lately.
The iinteraction is much better in the comment section of individual hubs, that draw many multiple comments, than in the forums. The focus is better and the tone is far more respectful and congenial.