Why can Darius be like this?
If you're a melee top laner vs Darius?
You lose every 1v1 unless you're like Yorick or Jax or something. You're forced to stay under turret or you'll get combo'd. Combine that with bleed and your health is GONE. Even if you 1v2 the Darius he might pull it off with his Noxian might and 12% heal per champ with Q.
If you're ranged top laner vs Darius?
Yeah, you can poke him all you want. You'll force him out of lane maybe twice. However, if you get just the tiniest bit too close? PULL AUTO W Q and you're half health. Not to mention that if you can't get away from him at this moment, you die.
He's unbeatable in lane. I get that he's supposed to be a lane bully, but he has maybe 2 or 3 counters at most. 
all have favorable matchups against him, and that isn't even taking into account his ranged counters