Would you consider the 32-7 victory against Chicago last year a blow out?
And did anyone predict that going into that game? Minnesota loss....Rams loss/tie....allowing the Giants to look like super bowl champs despite not doing so for most of the season....etc.
Even in the championship seasons, the losses always came from the least expected teams.
You look at all super bowl winners or even elite teams and this is what you typically see. The reason being is that the teams play hardest for the best teams and allow themselves letdown games against lesser opponents.