Since a lot of Vikings fans are incapable of objectively evaluating Kirk Cousins after three full seasons of ups and downs and an offseason of vaccine hesitancy, let's let Pro Football Focus do it instead.
Per PFF, Cousins was actually quite good in the Vikings' 27-24 Week 1 loss to the Bengals. And having had a chance to re-watch the game and consider the context of everything, I tend to agree.
Factoring in a variety of things, including expected points added, Pro Football Focus had Cousins graded as the No. 6 QB out of 32 Week 1 starters.