If I am not mistaken, I remember watching one of those Pistons Championsip reviews on ESPN Classic, and Laimbeer said something to the effect of "They say we havn't won in Portland for the past 10 years" or something to that effect. They won that series in a sweep if I am not mistaken.
Those stats don't mean much. Every one of those games were close. Last year, the Pistons were close, but that was the game Big Ben got injurred (not unlike this season with Duncan). Both were affected for the playoffs.