The reason you are seeing the same teams is because they are the best teams. You really want to see crappier teams in the playoffs? We should get in if we are good enough, not because they let the rabble in.
You really want to see a 3 loss team in a playoff? When you lose 3 games in cfb, that generally means you suck, not that you had a bad week. If that team shows up in the playoffs, it's gonna be ugly, not a cinderella story.