I dont think it is fair to compare 5 years of Willie Parker to 5 years of Rashard Mendenhall. Mendenhall after all has had some injuries that have limited his availability on the field over his 5 year period. Mendenhall has missed 21 games over his career. And those 21 games to Mendenhall and those numbers are way more in favor of him over what Willie posted. And Willie Parker played for a Steeler team that was much more run heavy than the one Mendenhall has played on the past couple of years.