4. 1989 49ers (won Super Bowl XXIV)
Take Joe Montana and offensive genius Bill Walsh, and give them one of the greatest wide receivers of all-time, Jerry Rice, and what do you get? You get one of the greatest teams of all time.
It’s tough to say the team under-performed in a regular season in which they went 14-2. However, once the made it to the playoffs they shifted gears and blew out their opponents 126-26. This includes a 55-10 win over the Broncos, which is one of the most lopsided scores in Super Bowl history.