@SilverZeo: I don't think sternness is a factor at all when determining if someone is an anti-hero. An anti-hero has major major negative issues with either what they want to do or how they're doing it. Being stern is like being strict and not mincing your words. That doesn't make someone an anti-hero, that just makes them stern.
It’s way too long, haphazardly plotted and teases on being more than a joke machine without really following-through, but I laughed more at Anchorman 2 than almost any other comedy this year.