I dunno, I'm starting to warm to the idea of point differential, and I get that "playing style" can change things, but if Penn State beat's Michigan 42-10 this weekend vs beating them 13-10, I think most people would agree the 42-10 win was more impressive, more dominant etc.
ultimately if you are using a tiebreaker you lost to somebody, so you got no one to blame but yourself, ala Ohio State 2 of the last 3 years.
When we played Tresselball and beat teams by 3 points I'd still be fine with using a point differential in the formula at some point, maybe not as the first tiebreaker.