He’s the fourth highest rated passer ever through 43 career games
He’s 29-14 as a starter
He is second in the NFL since 2016 in 4th quarter/OT game-winning drives
His QB rating in the final 5 minutes of 1 score games is a staggering 121.8, second only to Brees since 2016
Passer rating, not QB rating, and with good reason.
The passer rating is a pretty worthless measure in today's NFL. It overvalues completion percentage, which matters when completion percentages get as high as they are these days.
More importantly, though, are the things passer rating doesn't account for at all: QB rushing, sacks and fumbles. I would argue that trying to evaluate Dak without accounting for his rushing, sacks and fumbles is a truly pointless endeavor.