I'm not sure quite how to put this, but here goes:
AFF's greatest strength is its inclusiveness. It attracts writers from every genre and every fandom and welcomes them all. Content-wise, almost nothing is forbidden. There's a section in the archive for everything anyone might want to write. The forums are similarly designed: lots of forums and subforums for every topic.
But the archive and the forums are essentially separate entities. Becoming a member of the archives does not automatically make you a member of the forums, but you can't join the forums without having an archive account. From what I can tell, the vast majority of AFF's members do not have forum accounts, so the population of the forums is a tiny fraction of that of the archives.
As a result, the forums are a little like one of those huge, old English mansions that has hundreds of rooms but, in modern times, only a few dozen occupants. And sometimes I feel like we're all living in different wings of that mansion. Yes, there are a few people in neighboring rooms on the Naruto floor of the Anime wing, and there's a cluster of occupied rooms around Harry Potter Parlor, but a lot of us are just kind of shouting across the courtyard at one another--we don't have a common fandom or genre to discuss, so we talk some about writing, a little about reviews, and a little about random other stuff.
I know there's nothing to be done about this, and it's not intended as a bash of AFF; if anything, it shows that AFF has incredible infrastructure and a great operating philosophy. And the people here are great. But despite being a member of this community, I don't always feel like I have much to talk about at the dinner table.
I just wanted to get that off my chest. If you have read to this point, thanks. If you haven't read to this point, then...wait, what?