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Message: <blockquote data-quote="PackersRS" data-source="post: 384561" data-attributes="member: 1429">The problem with QBR and any other rating system is that it cannot calculate how many times Tom Brady changed the play or found the mismatch before the defense could adjust, play that in almost any other QB's hand would have resulted in failure.However, the law of averages have a play in it. While this week Fitzpatrick had a better rating than Brady despite Brady playing better than Fitzpatrick, in their career average, the rating is not even close.What those rating systems allow you to do is to know in a fairly accurate measure how the QB played. If a QB posts 130 QB rating there's no way he played a bad game. It doesn't necessarily means he played better than his opponent, who had a 120 QB rating, though.Those systems have a margin of error, if you will, that decreases with the extension of the sample size.I tend to look at those QB rating systems as measuring how much water you have in a cup, without any ruler. You can tell if it's more than half, less than half, etc... You can't tell exactly how many lts are in there.</blockquote>

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