http://insider.espn.go.com/espn/blog/index?entryID=4041715&name=olney_buster"His numbers are in serious decline, with his OPS dipping from 1.023 in 2003, when he was with the Atlanta Braves, to .725 last year, his worst showing since 1991. Yes, he was injured, but hey, that's what happens when you age: You tend to get hurt more.
But you can bank on this: At least at the outset of his time with the Mets, he will impact games. He will make opposing managers do things they wouldn't normally do. The presence of Sheffield in the Mets' dugout will strike fear in the minds of opponents in the other dugouts. This is why the Mets' signing of Sheffield for the minimum $400,000 is an excellent move (and it would have been an excellent move for the Phillies, as well)."