I even remember Marino talking about the Seahawks that year on Inside the NFL, saying how they are a good example of what is wrong with the conference playoff system. Buffalo was a far better team in 2004 but because of the arbitrary dividing lines of the conferences, the Bills don't get in while the Seahawks win the division lol.
A similar argument that is more regularly made is that sometimes the 2 best teams in the league are in the same conference and thus the Superbowl isn't always a match between the 2 best teams in the league.