The teams with the worst record in the Super Bowl are the Minnesota Vikings and the Buffalo Bills, who are both 0-4 in Super Bowls. The Bills lost those 4 consecutively from 1991-1994
Pittsburgh is the NFL that has the record of two repeat championships in the NFL. There are six other teams that have own a repeat championship once.
0-16
Lions
The Houston Texans, with a record of 2-14, had the worst season in the 2013 NFL regular season.
The Cleveland Browns had the worst record in the 1999 NFL season with a record of 2-14. The New Orleans Saints had the second worse record, finishing the season at 3-13.
The NFL team with the worst overall record in 2008 was the Detroit Lions, who were 0-16.
The Houston Texans.
The Giants worst NFL record to date was 1-12-1. This was back in 1966, which saw the Giants finish in last place.
Detroit Lions 0-16
The Pittsburgh Steelers have won the most Superbowls (6). If you included pre-Superbowl era NFL championships, then the record is held by the Packers with 12 (3 Superbowls and 9 pre-Superbowl championships).
The Miami Dolphins at 1-15.
Detroit lions