Just wanna say, as Mastery 7 Darius, I have NO COMPLAINS about his nerfs
I was already highly expecting it to come soon, since I can tell he's already very oppressive against melee champions at top lane,especially against Nasus & Sion. Darius can get pretty devastating whenever he comes into contact with 5 stacks of Bleed, and from that moment, that's where he gets dominating in teamfight or skirmishes.
All I can say is that Riot does a good job in starting their action on Darius's nerfs, especially on the Bleed changes. Probably expect more to come soon, who knows.