It wasn't just not perfect, imo. Our only chance in that game was to keep scoring. If Josh missed a throw, sure, yeah it happens. A pick there basically cut our win probability in half.
If you want to compare Josh/Mahomes, here's one.
The Bills are 1-6 in 2023 when our defense allows 20 or more.
The Chiefs are 2-3 in 2023 when their defense allows 20 or more.
2022
Bills 6-3
Chiefs 9-3
2021
Bills 3-4
Chiefs 4-5
2020
Bills 6-3
Chiefs 8-2
The standard should be like playoff rivals no? Better than league average sounds like a "happy with McD making the playoffs" type stat.