I think a common problem with this is the simple display of a title leading to a variety of responses from any and anyone with an opinion on that matter. The problem with this is the context of that post is never shown, which is a problem when it comes to class forums. People making posts on a class forum aren't going to include the context of their class in that title or in that post, which can lead to a lot of irrelevant answers from outsiders seeing the thread on the main page and answering within the context of a different class. I see this over and over, and I'm sure everyone else does with people talking about pvp/tanking/survival issues aimed at people of one class being answered by those of another. Primarily because people see the thread on the main page, assume its aimed at a general audience and answer how they please.
The suggestion is class forum posts which are posts aimed at a specific audience not be indexed on the main page which leads to them being answered by a mass audience. Or for the forum name to be shown with it so people don't actually need to enter the thread to understand the context of it.