They deserve it:
NFL Championships:
13 Green Bay
9 Chicago
8 NY Giants
6 New England, Pittsburgh
5 Washington, Dallas, San Fransisco
4 Cleveland, Balt/Indy, Philly, Detroit
3 Rams, Denver, Raiders
2 Cards, Ravens, Seattle, KC, NY Jets, TB, NO
0 Vikes, Bills, Bengals, Panthers, Falcons, Chargers, Titans, Jags, Texans
13 wins are more than the bottom 17 teams combined! It's also more than the 3rd and 4th place teams (NE 6+ Pitt 6)
Winning 13 out of 18 trips to the final game is a .722 winning %.
(4 wins or more only)
.833 SF
.750 Pitt
.722 GB
.667 DET
.625 Dal
.545 NE
The Pats have had a very nice run, recently: 6 championships in an 18 years span.
The 49'ers won 5 in 14 years.
The Steelers won 4 in 6 years.
The Lions won 3 in 6 years.
The Browns made it to the final game in 6 straight years and 7 of 8 but won just 3.
The Pack probably had the nicest dynasty by winning 5 in 7 years ('61-'67) and made it to the final game in 6 of 8 seasons ('60-'68).
The Packers also dominated from 1929 to 1944, winning 6 in those 16 years (better than the Pats 6 in 18), and they made the final game in 9 of 18 years ('27-'44).
Some more ancient history: from 1920 to 1946 (27 years) these 3 teams made the finals this many times:
15 Chi (7 wins)
11 NYG (3 wins)
9 GB (6 wins)
35 Total (16 wins)
65% of the finals' teams were these 3!
59% of the championships were these 3!