Here's a quick look at why that argument really doesn't hold any water.
There are 13 teams in the NFL who have a record above .500. This is simply the number of teams that each has played (through 14 games) that was also above .500.
Jacksonville 8
Baltimore, Buffalo, Indy, NE, NYJ 6
Pitt, S.D. 5
Denver, Green Bay, Minny, Philly 4
Atlanta 2
If you're going to say Buffalo has played a weak schedule, then everyone has played a weak schedule (except maybe for the Jags and Indy, who finish with 2 +.500 teams).