ESPN computes a metric called Total Quarterback Rating (Total QBR) that showcases how players at the position impact the game.
ESPN writer Seth Walder recently compiled the 2017 numbers for Total QBR and found that Vikings quarterback Case Keenum had the second-highest mark at 69.8.
Walder wrote:
Case Keenum — and oft-overlooked quarterback — proved he was capable of an oft-overlooked skill in 2017: not getting sacked. Despite being blitzed at the second-highest rate in the league and pressured at the seventh-highest rate among qualifying starters, Keenum was sacked at the sixth-lowest rate in the NFL.