I havent seen Darius at pro arena since S5 Worlds
Seriously why some champs are allowed to stomp solo queue and to be viable competetive pick at the same time? 

etc.
is a real cheesy punisher. He doesnt bring anything worthy to his team untill someone on enemy team fail. Seriously can you add some decision on the champ? The only thing he can do is to wait untill enemy team will stop paying attention. This is just stupid.
Counting only on enemy team mistakes isnt good game design.
I like how his current E may cancel enemy dashes like Riven third Q or Zac E. This thing looks like a solid mechanic which requires good timing. May be focus his kit arouns this ability? Remove heal from Q and add 1 (may be 2) seconds reduction on E per every champion who got strucked by blade. We can move his sustain to more healty way. Small flat heal for killing blow with W (15-75) HP just for laning phase and 50%/75%/100% spellvamp on R with every successful recast. So he would have so called crazy heals only when he's actually allowed to dunk people. Otherwise he will just pull enemies for the team.
. Ahri could certainly use a nerf for solo queue, but I can't say I have seen her on of the pro scene.