It's not any less representative of a player's all around ability than Home runs or Stolen Bases, and those are accepted stat categories. I don't see how adding another category wouldn't just add another wrinkle, another edge for good fantasy owners over bad fantasy owners.
That said, I wouldn't like it simply because I'm lazy and very few sites have those stats widely available like the traditional stats.
Grady Sizemore will have more value than Jason Bay regardless of draft position
Aramis Ramirez in 155 G will hit over .300 40 HR 110 RBIs
Brian McCann will have more value than Jorge Posada regardless of draft position