No penalty stealth + slow + poison + tower-raping ultimate. He's not as noticeable in high ELO where you have to constantly stack specific teams with ranged disables to do anything, but in PUG where everyone is playing more casually the game can easily be decided by him alone.
ultimate that rapes tower? where?
in the past i would agree, but with backdoor bonus his ultimate dont do anything to turrets, only on late late game (50 mins +) and at this point the game is already decided
twitch can destroy tower easy with some DMG build, but everyone can, even soraka can destroy towers with few hits
he dont need a nerf, he is a good and balanced char, there are so many easy ways to counter twitch