NFL - Total Quarterback Rating shifts the way we see the position - ESPN
"QBR is scaled from 0 to 100, with 50 representing league-average performance. For a single game, a rating in the 90s is terrific; last year, Vick's six-TD Monday night symphony against the Redskins topped the charts at 99.8. For a season, any QBR above 65 is Pro Bowl-caliber, and Tom Brady led all starters with a 76.0 QBR in 2010."
