The unfortunate reality is that anime simply isn't popular enough on TFP to warrant its own forum. As big as TFP is, it really isn't that big and very few people on here enjoy it, not to mention how broad a subject it is.
Hell, even
Tilted Programming doesn't even deserve its own forum. It only got one because of long time requests from the very few but enthusiastic programmers on TFP.
Having said that, it's unfortunate that there's no anime forum, too, because a single thread about something as broad as anime simply doesn't cut it. It's not useful to see a post about one series only to see a response be another post about some other series. If you have something to say about anime, unless a moderator has said otherwise (and I don't see why they would have), please start a new thread...