that logic would work if it was telegraphed. I feel bad about myself when someone sidesteps, knowing that it required at least a cursor drag and I could, you know, predict it. In Fizz's case it's a reactionary DLKGHSOIGHWTWTET GET OUT OF THE FIRE button press that I can't exactly predict unless I know he's used it, which I can't exactly bait it out by holding back, so it's a "get out of jail free" card.
Honestly though, i think Fizz, despite being a no skill champ (I mean, I went on a rampage once when he was on free week and i'd never played him), he's at the very least balanced so most people don't know about him. I don't think he needs a major change or heck, even much of a nerf. Doesn't mean I'm banning him any chance I get (along with akali and fiora).