Fans find apparently counterintuitive results hard to swallow. Besides, the computer polls don't even agree among themselves. In the end, when it comes down to determining the merit of various methods for ranking teams, the value of any particular system resides in the mind of the beholder. There is no unique, optimal way to devise an objective ranking scheme. Moreover, there's always the temptation to fiddle with the mathematics to obtain a result more in line with human thinking, in effect enshrining preconceived notions of how things should turn out.
Every scheme has particular strengths and weaknesses.
Invariably, when a method is tweaked to get rid of one undesirable feature, another counterintuitive result pops up. It would be interesting to run computer simulations to see what sorts of anomalies could arise when the system is used. Ohio State fans might disagree. What would have happened if three, top-rated teams, instead of just one, had actually ended their seasons undefeated isn't clear. In this business, there's always something to complain about.