Well, according to one poll they are.
An ESPN fan survey found the Falcons to one of the bottom ten most popular teams out there today, which shouldn't surprise anyone at this point. Keep in mind that this little survey was only 1,500 people, which is hardly a representative slice of football Americana. Nonetheless, you'd be hard-pressed to argue that the Falcons have the nationwide fanbase of the Dallas Cowboys, Green Bay Packers or New England Patriots.
Now, does it matter overmuch that our beloved birds are not the most popular team in America? I'd say no. It's a little disappointing that the national fanbase isn't there, but most of those fans are—to be polite—raging bandwagoners in the first place. Winning a Super Bowl in the near future would attract more, but that's not what it's about. It's about the fans who have already begun living and dying by the team, the ones who will finally see their reward for doing so.
The NFC South as a whole didn't fare well in this poll, with only the hated Saints cracking the top ten. The Buccaneers were one spot ahead of the Falcons and by all appearances tied, while the Panthers were just below.
Given that and your own no-doubt deeply-held opinions on the matter, sound off.