http://www.espn.com/nfl/story/_/id/1...oved-qb-rating
The intent of Total QBR is to isolate each NFL quarterback's contribution to his team's fortunes as accurately as possible with the data available. It measures nearly every aspect of quarterback play, from passing to designed runs to scrambles to turnovers to penalties. QBR also strives to separate the performance of the individual quarterback from the rest of his team, all in an effort to rate the overall efficiency of each quarterback in the league
But now, QBR accounts for opposing defenses: Quarterbacks who face tougher defenses will have their ratings adjusted upward in proportion to the difficulty of their opposition, and those who face weaker defenses will have their ratings adjusted downward. This is one more step toward gaining a true measure of overall quarterback performance -- and a big step.
Next, we compute an adjustment to each quarterback's performance based on those estimates of how tough each defense is. We also factor in home-field advantage. It's no surprise that quarterbacks playing at home tend to have an easier time than those playing on the road. These adjustments are made underneath the hood of QBR -- on each quarterback's share of his team's expected points added (EPA) per play, which factors in nearly all aspects of quarterback play, including passes, scrambles, designed runs, sacks, turnovers and even some penalties. Those EPA rates are also adjusted to correct for performance in "garbage time," when the game's outcome has effectively been decided.
It sounds like your mad about Johnson having the 3rd best QBR score for the season for the skins. I don't get it but that's fine. Rationalize it anyway you want.
Alex Smith wasn't good this year, at all. He never lived up to the trade or the coming contract. I tend to think QBR is a better to look at the over all performance for the QB. Above is what they are score...that's really all I said. take it or leave it