Almost every ADC is braindead in this meta. Get instakilled by an assassin with little counterplay or wreck teamfights by simply clicking while your front line and mid lane does everything.graves is good because all you need to do in a fight is press q then r and win
maybe he's not good in silver because teamfights happen once and that decides the game but he's still a really oppressive lane bully against pretty much everyone that isn't cait or sivir
idk about the point about getting outscaled i don't follow the pro scene at all but he really doesn't get outscaled by sivir, cait, jinx, of course he gets outscaled by vayne, kog, trist
and i quote GoldenValley "i am diamond and i can confirm it doesn't take diamond to play graves because he is braindead"
-my exaggerated opinion