See, how do you factor defense into that equation though? As a fictitious example, what if Ray has a line something like 11 points on 4-12 shooting, 2 assists and 2 rebounds against the Pistons, but he has a hand in Rip's face all night and holds him to 4 points on 1-11? How do you factor that in? His box score is probably going to suggest "poor game", but in reality his performance would have been significantly better than that label. In other words, this doesn't pay any attention at all to thing that don't show up in the box score. I know that's hard to retroactively put a value on, but it's still an important part of the game.