I disagree, I think Kars is a great villain and could’ve used some more screen time although Dio, Kira and Diavolo could manipulate time itself, not only this but they had stands which Kars could not see.

Kars had the ability to change into or add any animal / evolutionary parts to himself, while a powerful move, Dio in his prime once he had taken Joseph’s blood was at his full vampire self and had increased strength because of his stand, the only way Jotaro won was because he stopped time without Dio or anyone knowing of the ability.