If we go back 15 years...
AFCW Regular Season results 1997-2011)
Denver Broncos: 137-103 (9 winning seasons, 2 losing seasons & 4 .500 seasons - 3 division titles & 7 play-off appearances, )
San Diego Chargers: 119-121 (6 winning seasons, 5 losing seasons & 4 .500 - seasons - 5 division titles & 5 play-off appearances)
Kansas City Chiefs: 116-124 (6 winning seasons, 8 losing seasons & 1 .500 seasons - 3 division title & 4 play-off appearances)
Oakland Raiders: 98-142 (3 winning seasons, 8 losing seasons & 4 .500 seasons - 3 division titles & 3 play-off appearances, )
AFCW Play-offs results 1997-2011)
Denver Broncos: 9-5 record in the play-offs, 2-0 in SBs
Oakland Raiders: 4-3 record in the play-offs, 0-1 in SBs
San Diego Chargers: 2-5 record in the play-offs, 0-0 in SBs
Kansas City Chiefs: 0-4 record in the play-offs, 0-0 in SBs
So yes DS, when your Raiders have actually made it to the play-offs over the past 15 years, they have done much better than the Chargers & Chiefs