The Bengals have only made the playoffs 6 times including 2009 season since 1980.
Their post-season winning percentage in the years they have made the playoffs is 45.45% with a 5-6 record.
Notably in 2 of the playoff runs the Bengals made it all the way to the Superbowl only to lose to the San Fransisco 49ers each time.
Detailed results below for each year
1980 - Did not make playoffs
1981
AFC DIVISIONAL PLAYOFFSJanuary 3vs BuffaloW28-21
AFC CHAMPIONSHIPJanuary 10vs San DiegoW27-7
SUPER BOWL XVI IN PONTIAC, MICHIGANJanuary 24vs San FranciscoL21-26
1982 - NB strike shortened season
--FIRST-ROUND SUPER BOWL TOURNAMENT--January 9vs NY JetsL17-44
1983 - Did not make playoffs
1984 - Did not make playoffs
1985 - Did not make playoffs
1986 - Did not make playoffs
1987 - Did not make playoffs
1988
AFC DIVISIONAL PLAYOFFSDecember 31vs SeattleW21-13
AFC CHAMPIONSHIPJanuary 8vs BuffaloW21-10
Super Bowl XXIII IN MIAMI, FLORIDAJanuary 22vs San FranciscoL16-20
1989 - Did not make playoffs
1990
AFC WILD CARD PLAYOFFSJanuary 6vs HoustonW41-14
AFC DIVISIONAL PLAYOFFSJanuary 13at LA RaidersL10-20
1991 - Did not make playoffs
1992 - Did not make playoffs
1993 - Did not make playoffs
1994 - Did not make playoffs
1995 - Did not make playoffs
1996 - Did not make playoffs
1997 - Did not make playoffs
1998 - Did not make playoffs
1999 - Did not make playoffs
2000 - Did not make playoffs
2001 - Did not make playoffs
2002 - Did not make playoffs
2003 - Did not make playoffs
2004 - Did not make playoffs
2005
AFC WILD CARD PLAYOFFSJanuary 8vs PittsburghL17-31
2006 - Did not make playoffs
2007 - Did not make playoffs
2008 - Did not make playoffs
2009
AFC WILD CARD PLAYOFFSJanuary 9vs NY JetsL14-24
All data from http://www.bengals.com/team/history.html
Since 1970, the Bengals have a total record (regular season and playoffs) of 293-369 for a .440 winning percentage. This ties them for 26th with the Cleveland Browns. Only the Saints (.436 winning percentage), Cardinals (.411), Buccaneers (.403), Lions (.400), and Texans (.362) have a lower winning percentage.
The Cincinnati Bengals made the playoffs 6 times since 1989. They have lost all six wildcard round games that they have played in during that period.
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That would have been during the strike season of 1982. Only 9 games were played during the regular season and the NFL expanded to playoffs to include 8 teams per conference. This was the only season a team with a winning percentage under .500 made the playoffs (the Lions and Browns were both 4-5). Since the NFL went to a 16 game schedule in 1978, other than the 1982 strike season the fewest games a playoff team has won is 8.
In 1912 when the team was called the Highlanders, the team record was 50 - 102. for a .329 winning percentage. Since the team was named the Yankees in 1913 the worst season was 1913 with a record of 57 - 94 for a .377 winning percentage.
Since 1970, the Bengals have a total record (regular season and playoffs) of 293-369 for a .440 winning percentage. This ties them for 26th with the Cleveland Browns. Only the Saints (.436 winning percentage), Cardinals (.411), Buccaneers (.403), Lions (.400), and Texans (.362) have a lower winning percentage.
The 49ers have the highest winning percent because they are undefeated in superbowls. P.S. They are 5-0 in superbowls winning against the Bengals,Dolphins,Broncos,Bengals again, and finally the Chargers.
Since their addition to the NFL (1968), the worst winning percentage season for the Cincinnati Bengals was 2002; the team went 2-14 (.125).
The Cincinnati Bengals made the playoffs 6 times since 1989. They have lost all six wildcard round games that they have played in during that period.
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Have the Buffalo Bills won since 2000?
As of the start of the 2008 season, the Lions all time regular season record is 488-553-32 for a regular season winning percentage of .470. The Lions all time playoff record is 7-10 for a winning percentage of .412.
Oklahoma
According to today's Baltimore Sun, "The Steelers have the best home winning percentage (.722) in the NFL since 1970." http://www.baltimoresun.com/sports/football/bal-ravensscout0928,0,734965.htmlstory Must be a steelers fan since he doesn't include the year 66,67,68,69 in which the Steelers were terrible. Include those numbers and the steelers do not have the best home winning percentage. Since 1966 the Kansas City Chiefs have the best winning percentage followed by the Packers.
Since the NFL went to a 16-game schedule in 1978, the Cowboys have been 13-3 (.813 winning percentage) twice: 1992 and 2007.While playing a 14-game schedule, they were 12-2 (.857 winning percentage) twice: 1968 and 1977.[The above info was found at www.pro-football-reference.com.]----------
As far as winning percentage goes, the Bulldogs went 1-5 in 1904 and 1905 for a winning percentage of .167. Since they have been playing a regular season of 10 or more games, it is a .273 winning percentage (3-8) in 1953.
the Detroit lions