The south has been competitive virtually every season of its existence. Every team has one the division at least once...how many divisions can say that?
Even so, I believe the reason for having Miami in the East was because of the rivalries...of the 5 teams, Indianapolis didn't have the tradition of the other 4. Of course, today we look at the Indy/New England rival as tops.
The NFC West can say they've had all 4 teams win the division at least once too.
Well, I was wrong. Jacksonville never won the division. Maybe a better barometer of a division's success is the number of playoff contenders. How many divisions have had 3 of its teams in the playoffs in one season? The teams that won the AFC South had a (apart from last year) had an 11-5 or better record.
In 2007, the South had 3, and in that same year New England went undefeated with the rest of the division winning a total of 12 games. So the point isNew England does not fair as well being in the South.