Graves, King of ADCs
Graves is too effective this patch considering his ease of use IMO
Although I know there are actually plenty of other good ADC picks too right now, like Kalista, Corki, Caitlyn, Jinx, Kalista, Sivir and Kalista...
To hit Graves we should either tap Grave's early game or lower the massive amount of AoE damage his ult does later in the game. The ultimate is probably a bit too strong for an instant cast bursty aoe ability. Graves can just press R and contribute decently to a fight... It needs to do reduced damage to the backline or just slightly reduced overall. Also If we were to tap hit Grave's laning we should either make him squishier or increase his mana costs IMO. I think it's good Graves can be tanky but perhaps his passive should have less uptime so he has to time his opening more carefully or kite around fights for longer. Increasing mana costs is just to give him a drawback in drawn out laning...
How about a wilder idea? Significantly reduce the damage of R but give it an armor reducing effect. Yeah I suppose R would feel much crappier on its own though, but with the right numbers his burst could be the same if he has to get closer to Q. Definitely a big nerf without other teammates with AD damage.
I'm not saying all of this, these are just ideas.