There are countless ways to evaluate quarterbacks, but one of the most underrated traits is consistency.
A quarterback who consistently keeps his team in games is sometimes better than the one who carries it in a few games, but costs it a few others.
To determine who this year's most inconsistent quarterbacks were, I evaluated their performance based on how consistent their Total QBR was from game to game.
In the following slideshow, the 27 quarterbacks with at least 10 qualifying QBR games are ranked based on their average variance in QBR.
This was calculated by comparing their full-season QBR to their QBR in each individual game.
Let's use Nick Foles as an example. Foles' Total QBR for the season was 69.0. In Week 17 against the Dallas Cowboys, he posted a QBR of 40.8. This gives him a QBR variance of 28.2 for that game.