Of course they do. Teams that win impressively are often moved ahead of teams that don't win impressively. This in turn effects the BCS. The same goes for losses. If someone beleives that Michigan didn't play as well as the score indicated, then sure, it does matter. Exactly. Teams can win close games and have pretty well controlled it. Michigan/Ball State, the Cards got to the 2 yard line with a chance to tie, but Michigan led almost the whole game and by as many as 15. Michigan/Penn State, only a 7-point margin, but did anyone really think Penn State was going to win that game at any point during it? Heck, Ohio State/ND last year was markedly similar to the OSU/Mich game this year in that OSU outplayed the opponent significantly but made a couple of mistakes to allow the other team back in it. The only difference is that they scored late in the ND game and not in the Mich game. You can control a game without blowing out the opponent.