Passer Rating is not a good stat to define a player’s career, as it ages very poorly with generations and doesn’t factor in many of the things that make a QB great.
Scrambling ability is ignored completely. According to passer rating, Dak Prescott is as good with his feet as Peyton Manning was.
Touchdowns and Interceptions (particularly the ratio) are extremely weighted in passer rating. For example, QB’s in the 70’s could throw as many picks as TD’s and have great seasons. That pretty much defines HoFer Terry Bradshaw’s career. Doesn’t mean that now with hindsight we realize he wasn’t a good QB, it’s just how the NFL was played in the 70’s, as by rules, game plans, and what was stressed.
This is no more apparent than when Peyton Manning set the NFL record in 2013 for yards AND TDs in a season, yet Nick Foles had the league’s best passer rating just because his TD:INT ratio was 27:2. He didn’t play as well as Peyton, best better teams, nothing. He just had a wonky ratio, and passer rating digressed.
Troy Aikman’s offense dictated that Emmitt Smith scored all the TDs when they got in the red zone. This meant his TDs per yards thrown was not great for the QB he was. He’s still the same Troy Aikman if he’s in that offense or not, but passer rating says he’s not. And so, he’s way down the list.
Drew Brees has a career 67.7 completion percentage, 0.1 off from Deshaun Watson as the greatest ever. Drew Brees is the only QB to throw for 5000 yards multiple times… and he’s done it for 5 seasons. Yet his passer rating isn’t even 100 because the formula demands excessive TD passes to match excessive yards, regardless of reason. He is actually penalized by passer rating for being too good at moving the ball down the field.
it is an archaic stat, and it’s why ESPN came up with QBR in the first place, because passer rating… isn’t good. QBR has its own problems, but it’s a lot better at acknowledging the quirks that we’ve detailed.