You Know, For Playing An Immobile ADC, I Don't Feel Rewarded
TL;DR: The buffs are nice but they don't address the problem. His kit still revolves around a useless passive.
I'm going to be honest here. His only AS steroid AND his only escape are both locked into a long CD Q, which is delayed by 6 seconds unless he initiates the aggressiveness. His only AD steroid is in a hilariously long CD ultimate. This leaves his early game really bad.
His end game is his time to shine, though. Kind of. Even in the LPL where comps are often built around him, he dies within the first five seconds of every fight pretty often unless his team is bulldozing. How do you imagine that plays out when your team doesn't prioritize peeling for their end game ADC?
He almost always also buys Bork and GB, giving him more CD-reliance. Unless all four CDs are up, even end game he'll be pretty mediocre. Even then it's purely for the short time his ultimate is active, which offers ANOTHER way to counterplay Twitch.
All of this evidently isn't enough counterplay. For some inconceivable reason, they nerfed the one thing his entire kit revolves around. His poison mechanic and Expunge. I thought Riot's philosophy was to not attack what made a champion unique and instead to cut off power somewhere else to present counterplay? Here all they did was take a bat to what made Twitch, Twitch. Before, he was an early game bully that scaled to late game. He needed a change, but they went overboard. The buffs are nice but they don't address the problem. His kit still revolves around a pretty mediocre passive.