he is not asking about nflforums.us. We all have our opinions, that is just my opinion. I dont see it as a valuable domain name.
I don't think that "forum" is really that bad compared to "forums". However, I understand the the NFL is a real pain about their trademark. A visible disclaimer (and not using the NFL logo) would probably alleviate most issues. If you believe in the domain name, I suggest that you develop the site.