Some things can be accounted for, injuries & fitness issues with important players like Grav, Macca and Isak. Slot also can't really help Salah's drop off in form after such a stunning season, and Virgil losing half a yard. You also have to take into account that there's quite a few new players that need to gel.
What really irks me is the lack of desire, getting fought off the pitch, not winning 50/50's or even 60/40's. The manager should be able to motivate the players enough, we should always match the opposition in energy & desire.
And also, the silly switching of positions. Dom at RB, VVD up front, Wirtz in a few different positions. This changing is not helping. Keep it simple and consistent.
Slot has earned a lot of credit last season, he's still far in the black, but he needs to do better.