After judging a quarterback by the company he keeps, I've expanded the field to show additional names with recent ties to the NFC West.
The chart below ranks these QBs by most starts since 2010 with at least 15 action plays and a Total QBR score in the 90s.
For additional context and to avoid implying any similarities between emerging star Colin Kaepernick and journeyman backup Brady Quinn, I've included an additional column showing cumulative QBR figures for all starts since 2010, regardless of how many action plays (all QB plays except kneel-downs, spikes and handoffs).
The information reflects negatively on St. Louis Rams quarterback Sam Bradford, who has just one 90-plus game out of 42 qualifying starts and a cumulative QBR score of 42.3, well below the 50-point mark indicating average play.
Some context is in order. QBR assumes an average supporting cast. Some quarterbacks on the list have played with exceptionally weak supporting casts. Bradford has arguably played with the weakest of the group, especially when factoring for the injury problems that wiped out Bradford and the Rams in 2011 in particular, when St. Louis led the NFL in adjusted games lost.
The Rams think Bradford's production will improve significantly in 2013 and especially beyond now that the team has acquired fresh, fast talent on offense. So, while we might reasonably have expected Bradford to have provided a few more exceptional performances to this point in his career, a case can be made that he has too often found himself in survival mode.