... geeks make a point to check out the NFL quarterback ratings each week. And more times than not, they find it difficult to tell up from down, good from bad. 

Meet the NFL passer rating system, which is the most maligned, least understood individual statistic in all of professional team sports.

“In a number of cases, I wouldn’t say the current system is an accurate reflection of a quarterback’s ability,” former Bears offensive coordinator Terry Shea told me years ago. “Look at the ratings as they exist today and you see guys at the top who don’t belong there.

"At the same time, you see guys in the middle or even near the bottom who don’t belong there, either. The system doesn&rsquo...

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