 Bill James cogently presented some of these criticisms in his book "Win Shares", foremost among them being the observation that an average player has a TPR value of 0, whereas in fact an average player has substantial positive value.The fielding component of TPR is also flawed, so its evaluation of fielding is poorly regarded by most fans.TPR has been greatly improved upon in a system called super linear weights, available in the archives of Baseball Primer.