In "The New Bill James Historical Baseball Abstract", Sabermetrician Bill James makes the point that McCarthy was held in such high esteem because of his introduction of the "hit and run" play into the game. This play, among other novel strategies (such as batter to baserunner signals, etc.) that he and his Boston teammates utilized, were a clever and gentlemanly counter to the rough and tumble "Baltimore" style of play which was, at the time, giving baseball a bad name. Nevertheless, in the same book, James also said that McCarthy is the worst right fielder in the Hall of Fame. As of 2014, McCarthy had the lowest Jaffe Wins Above Replacement Score of any player in the Hall of Fame.