Jackson Stats
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Reggie's a character, much easier to take now as such than at the time. ("Not enough mustard in the world to cover that hot dog", said of the infamous Reggie Bar "The only candy bar that, when you unwrap it, tells you how good it is.", etc.)
But in 5 WS, he hit .357, about 100 points higher than his season BA. Any accomplishment at the plate is more revered when it contributes to a win, and even moreso when it's in the WS rather than a league championship. Hence Mr October, legitimately, rather than Mr Playoff.
Rodriguez & Bonds have not performed well in the postseason. Maybe it's because they perform so well during the season that they run out of gas and it's time for their teammates to step it up. But the fans (and antifans ) expect that for all their noteriety and salary that they continue to earn their way. Unreasonable? Maybe...but so's their noteriety and salary.