Haven't played Darius much but i know that Black Cleaver is OP on him because bleed stacks proc the passive, shred armor and give you movespeed.
Dairus is the best top lanner , he have heal with q and very nice passiv hemoglobine + 5 stacks on ult and gg 1000 dmg
I HATE DARIUS! He is in my opinion perfect champion for little kids, you know his ult is perfect for learning how to count to 5... but seriousle .. riot built in ignite in his passive, and now once he fully stack it he can just hit another guy and automaticly get full stacks, then his q..it was broken AF but now its not that bad, dealing aow dmg in a circle and healing, not to bad. His w and e arent that scary nether pull and slow ( tho that crit can be quite annoying). BUT HIS ULT, its like, ok u deal a lot of , A LOT of dmg ok, once he targets you u can flash dash tp , whatever dmg still goes through, but why the reset riot... now every time i see darius i just instalock renekton.
So strong top laner which is apsolutly unstoppable if he gets feeded because of his massive lifesteal and dmg too,I watched plays on yt for this champion and I saw one guy had myb about 25% hp and 4 champs attacked him,but he with his lifesteal
Actually most of his power is from Q healing, that is way to op, his ulty is good only if you kill with it
His ult is balanced since it requires you to apply blood stacks before using it while Q has no cast time and doesn't affect your movement speed, deals ton of aoe dmg and heals you for a bunch while still being low mana cost and low cooldown which is ridiculous imo
You should never trade against him, only poke from range if you can, and farm, he falls off in the lategame