I think I know now why people still ban Darius
It's not because he is impossible to counter
Not because he can snowball really hard
It's because Darius can counter almost every top laner and make their laning phase a miserable experience. Seriously, other than Lulu and Gnar, I can't think of a single top laner that can consistently beat Darius in 100% of situations assuming equal skill and no jungler intervention.
Oh sorry, you didn't want that gold and xp did you Darius? Naw, you don't get to have fun today.