He is broken ofc, what do you except from an adc that has everything except mobility maybe but he has movespeed bonus...
Seriously his kit is the most overloaded kit ever made. When he will be played better, he will need to get gutted. Riot said he was supposed to be complicated but i don't find him complicated actually. A little bit of reading and one game in pratice mode and you understand 80% of his kit because his weapons are differents and you can easily recognize them.
First his passive stats are stupid. Giving Ad ok, giving As why not but giving free armor pen ? Aphelios is the only adc champ that can have access to free armor pen in his kit because of his passive.
Calibrum : The starting weapon. The range is too much. It's need to be nerfed. The next champ will be able to hit your from base with his AA if we keep on making champ like this.
Severum : Free lifesteal... And the active Q is too much powerful. The regen need a nerf.
Gravitum : So, what the purpose of Ashe riot ? You made a champ who can have the same passive as her. This weapon give him CC and ability to hit and run or to chase.
Infernum : Completely nuts. Graves needs to be close to you. This guy can have Graves AA with no CD and the ulti with infernum is broken. The dmg is disgusting.
Crescendum : Broken too, when he can stacks boomerangs, his AA can almost oneshoot someome.
This champion is dumb but i knew it honestly. Releasing a champ that has substain, dmg, poke, slow, CC, Zone dmg with critic, capacity to outrade everyone and dps + movespeed bonus.
How do you want to balance this ? It's like Irelia or Akali. You would need to gut their dmg to the lowest point to make them acceptable.
I don't understand why everyone is like "oh cool this champ and everything"... For me this champ is the sign that riot don't care about their game, about the balance and they learn nothing from overloaded previous champ.
The next champ will be able to AA you from base, i'm seeking the future guys.
PS : To all people who will show me his winrate, trying to prove he isn't broken. First he is a new champ and his play rate is around 90% so ofc his win rate isn't going to be good until people will play him better. And when they will be better on him, this champ will have 55-57% win rate because his dmg is insane and because his kit is overloaded.