Patriots' 10th super bowl appearance (1986 loss, 1997 loss, 2002 won, 2004 won, 2005 won, 2008 loss, 2012 loss, 2015 won and 2017 won in overtime).
They're 5-5 in SB record, about 50% or half the record.
4 NFL teams have better SB records.
* San Francisco 49ers-NFC (5-1, at 83%)
* Dallas Cowboys-NFC (5-3, at 62.5%)
* Pittsburgh Steelers-AFC (6-2, at 75%)
and Denver Broncos-AFC (3-5, at 37.5%)
Minnesota Vikings-NFC went 4 times, but not win. And Buffalo Bills'-AFC 4 in a row, yet they never win anything.
The Patriots or Pats is one of the best 4 AFC teams and least not forget the Green Bay Packers of the NFC (one of best 4 NFC teams) was the best NFL team before the first super bowl in 1967 which is over half a century ago, they won 4-1 in SB record (80%) .