Do not try to start a witch hunt against him. FeralPony's creations have never been so outwardly OP on launch as CertainlyT's and the majority of his champions have been underpowered or balanced. It wasn't until Riot started shaking up the items and masteries and giving consistent "little buffs" that became big buffs once the dust settled that most of his champions end up problematic. Jayce, Hecarim, and Rumble rotted in anonymity for years before lots of little changes coalesced into massive problems that gave them a power spike. Fizz has always been a problem, but then, no one is perfect.
Additionally, Graves was reworked by CertainlyT. He is no longer the creation that FeralPony created. Sona, too, had a rework a few years back, deviating from her original play style, and that was further changed last year with another minor update. Fizz, also, was updated last year, and not by FeralPony.