Sure, the lack of a playoff in college football sucks, but every few years, the national champ is pretty clear, brackets or no brackets. Case in point? 1971, when Nebraska, Oklahoma, Colorado, and Alabama finished 1-2-3-4, respectively. Why were the 'Huskers the clear no. 1? Well, they beat the other three (whupped is more like it in the case of Colorado and 'Bama). The Cornhuskers showed no mercy on opponents in '71, winning by an average of more than 30 points per game, and beating the Sooners in the "Game of the Century" on Thanksgiving Day. Undefeated + winning the "Game of the Century" = pretty badass.
1971 Nebraska Cornhuskers