The worst of all was pretty much every win the Pats had in the 2001 playoffs.
Football games are close and it is not surprising that every once in awhile one team will get a lucky break or a fluke and win that way. But the way the Pats win was the most improbable (obviously fueled by the fires of Satanism), bullshit way to win a championship that the league has ever and probably will ever see. The NFL made up a new rule on the spot and then Vinatieri hit a 50 yarder in a blizzard. Then against the Steelers the Pats literally won the game on special teams in the first quarter. Brady and their defense played like shit and yet they were ahead by like 21 points because of that nobody dickface who shall remain nameless. Then in the SB the Pats steal the Rams plays and Martz and co. take too long to adapt. Once they figured it out or the Pats ran out of footage or whatever the Rams were running up and down the field, but they didn't have enough time and once again Vinatieri saves the day.
Worst season ever. Worst champs ever. And worst year ever for America (this combined with the almost as bad events that preceded it in September pretty much cement this).