The Total Quarterback Rating takes into account a larger number of variables than the nearly 40-year-old NFL Passer Rating system -- including down and distance, field position and importance of the game situation.
The new QBR weighs rushes, passes, sacks, fumbles, interceptions and penalties and calculate the per-play net impact of the quarterback. As an example, a pass completion on third down that yields a first down is worth more than a completion for the same yardage that doesn't result in a first down. Plays in closely contested games also count for more in the system.
They are airing a special on ESPN at 8 o'clock tonight discussing it, and there are several links worth perusing. What do you guys think?
http://espn.go.com/nfl/story/_/id/68332 ... ack-rating
http://espn.go.com/nfl/story/_/id/68243 ... -variables
And to be subjective, an article defending the Passer Rating system
http://sportsillustrated.cnn.com/2011/w ... qb-rating/
*Just as a disclaimer, the stat is not useful for fantasy purposes.