So in recent weeks my forum has had a wave of spammers who have been able to freely post blatantly obvious spam on the site. Word filtering is absolutely ineffective to preempt them, and in the most recent case, isn't stopping them at all despite the terms being added to the post filter. In the support thread I filed, it was made clear your current anti-spam system only deals with user accounts, NOT with the content of the things they're posting. I'd say that's proven to be more or less useless.