We started the 2015 NFL Season with what seemed like divisional parity. That has all but vanished.
This has been a rather interesting NFL season to me through the first 6 weeks. A lot of preconceived notions have been blown away. The Seahawks opened the season at number 1 on a couple rankings, and the Falcons were hovering around 23rd. Some pundits had the Chiefs in their top-10, and they've been anything but world-beaters (even before Jamaal Charles went down).
That's not to say everyone was wrong about every team, I just like to point this out because as many fans like to deride statistical analysis: this is why games are played on the field and not in spreadsheets.