Warwick was his ONLY good rework and ONLY because he didn't lead it.
Every other champion he released has needed massive/repeated nerfs because they are inherently broken designs.
Thresh needed many nerfs because he was so strong that he was 100% pick rate and he outclassed every other support.
Yasuo is pure cancer with a stat stick passive, no resource and insanely low cooldowns.
Zyra had needed repeated nerfs until she was forced into the support role.
Zoe defies normal mechanics with every bit of her kit except for her ultimate, which is arguably the only balanced part of her kit.
He deserves a lot of hate for consistently breaking the game and saying "my champions should be exceptionally frustrating to play against" anytime he designs one from the ground up.
His designs do not fit into League. Plain and simple. He would be better off hired by Valve to create characters for DotA. If Riot wants a competitive game, CertainlyT cannot remain a champion designer. He would be better off designing mechanics for the map/special modes/new jungle mobs.