In what ways is Fizz not op?

Hi folks Fizz does not have a 100% winrate, so he is not omnipotent, yet I fail to see how he is not op. In lane you pretty much have to make the perfect freeze pre 6, or he can get farm and maybe poke you some. At 6 he gets a kill on any squishy that is not surrounded by his entire team every time his ult is up. And CC is ridiculously hard to time because an assassin has to be untargetable, since he cannot kill everyone in less than a second. But oh wait, he can! So how is he not op? Need help
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