One of the more prominent offseason analyses done is the ranking and evaluation of players at each position. While analysts utilize most of the tools at their disposal (standard statistics, advanced metrics, tape study) there is still some level of subjectivity to said analyses.
Matt Miller over at Bleacher Report has done positional rankings on an annual basis for quite a while now and he recently released his post on the top 50 quarterbacks from 2015. These rankings are released with the disclaimer they only take into account performance in 2015 – not projections or prior career accomplishments.