There are all kinds of metrics that folks use to evaluate quarterbacks.

Some look passing yards. Others look at passer rating or quarterback rating. Completion percentage is another method.

There's a problem, however, with all of those methods.

They're all dependent on the other offensive players on the field. A wide receiver dropping a pass can ruin completion percentage. A tight end not breaking a tackle can impact yardage totals. A bobbled pass can result in an interception.

Fortunately, Pro Football Focus has a metric that I believe accurately tells us exactly how good a quarterback is or isn't.

Adjusted completion percentage.

Here's how PFF describes adjusted completion percentage:

Adding context to completion percentage is important, and adjusted completion percentage accounts for some of the things that are out of the quarterback’s control. QBs are credited for on-target throws that are dropped, and throwaways, batted passes, spikes, and passes where the quarterback is hit are excluded from the denominator

Cincinnati Bengals quarterback Joe Burrow ranked No. 1 in the NFL in 2021 in PFF's adjusted completion percentage.

Kansas City Chiefs quarterback Patrick Mahomes came in at No. 2 (Green Bay Packers quarterback Aaron Rodgers was No. 3).

Mahomes was No. 17 in the NFL in completion percentage in 2021, but No. 2 in adjusted completion percentage. That tells that Mahomes was far better than the 4,839 yards, 37 touchdowns, and 13 interceptions stat line he put up this past season.

(By comparison, Burrow was No. 1 in completion percentage and adjusted completion percentage. We know Burrow was hit a lot in 2021, yet his adjusted completion percentage was only marginally better than his completion percentage. That tells us he made his fair share of self-induced mistakes last season.)

I know Mahomes has caught some heat for his performance in the second half of the Chiefs' loss to the Bengals in the AFC Championship game. And some of that is deserved — he could have played better.

But for the most part, it's those around Mahomes that need to pick it up in 2022. The former NFL MVP is doing his job more often than he's not.

Featured image via Denny Medley-USA TODAY Sports