posted at 6/4/2013 1:40 PM EDT
This post is about QBR. You keep referencing Passer Rating, and calling it QBR.
Sanchez's QBR was NOT 92 in that game. His QBR was 22, which is horrible, because his overall quarterback play was horrible. His Passer Rating was 92, which is a bit above average, because he had a pretty average game passing the football.
Again: QBR = the new ESPN stat, introduced 2 years ago, measures overall quarterback play. Possible values range from 0-100, with 50 being an "average" performance.
Passer Rating = Passer rating; has actually been around since 1971, although it gained popularity in the early 90s. Weights the following statistics equally (although it caps comp. % and yds/att): TD/attempt, INT/attempt, Completion %, Yards/attempt. Possible values range from 0 to 158.3. This statistic purely measures passing performance, and NOT overall quarterback play. An "average" passing performance has changed as the league has changed; in the 2000s, an 80-81 has generally been "average."
Statistics are useful so long as you understand what they're trying to measure, and don't discredit them simply because they don't measure something they weren't ever intended to measure. In the case of Passer Rating, it was never meant to measure overall quarterback play, but merely passing; i.e. the act of a football leaving the quarterback's hand in a pass attempt.