NFL free agency 2022 - Most overrated, underrated at every position, including Marcus Mariota, Calais Campbell, Randy Gregory

Free agency is an important piece to the NFL team-building puzzle, giving organizations an opportunity to improve with instant-impact players before the 2022 NFL draft. Finding a crucial value in free agency — which begins next week — can make a team into a contender, while spending significant money on a player who doesn't live up to his contract can set back a franchise multiple years.

Last year was all about the quarterback movement, while this year's class is heavy on contributors in the secondary and at tight end. A big part of the puzzle, though, isn't just making the big splash. It's making the moves for lesser money that pay off big, such as wide receiver/running back Cordarrelle Patterson last year with the Atlanta Falcons.

Pro Football Focus is here to look at the players at each position who could end up being overpaid mistakes and who could be under-the-radar value signings. With the help of PFF's unique play-by-play grading system and other advanced data, we can best identify those candidates. Here are the most overrated and underrated free agents at every position:

Jump to a position:QB | RB | WR | TE | OG | OTEDGE | DT | LB | CB | S

2021 team: Bills | Age entering 2022 season: 28

Trubisky ranked third-to-last in passing grade across his four seasons starting for the Chicago Bears. No downfield passing, poor decision-making and inaccurate throws plagued Chicago's offense with the 2017 No. 2 overall pick. It has been rumored that many quarterback-needy teams are interested in Trubisky's services anyway, blaming some of the struggles on Matt Nagy. There's enough data to show that the woes are a Trubisky problem.

2021 team: Raiders | Age entering 2022 season: 28

There is an argument to be made that Mariota is