Okay, I don't know how long you guys have been playing league but i'm just going to assume by the people who are dissagreeing that they havn't reached level 30 yet.
Fizz is OP, Fizz doesn't need CC all he needs is a Phage, or a Rylai's Crystal Scepter, his ult slows too.
Fizz is OP because everyone that I lane against in mid with fizz, gets destroyed easilly. I may be good but I can just tell that fizz is doing way to much damage way too
easilly
His Q, I don't think it's OP but it's really a great spell that combines with half his abilities..
His W is like a built in madreds which lets him rape tanks as well - OP
His E, can dodge almost any skill, low CD as it levels allows him to jump in and out of range of towers and tower dive his opponent that is trying to play safe, because he knows that fizz is OP. but he still gets wrecked. - OP
His Ult, is really easy to get off the range on it is also amazing + knockup and great damage... - OP
Fizz can play either AD, or AP very effectively but I find going AD is better.
He's just too powerful atm, which allows him to get fed really fast. I expect them to increase the cooldown of his E, nerfing W slightly, and possibly reducing his base health
But I don't think the nerf will hit fizz that hard, he will always be a great champion.. earlier today I did a 5 premade and we faced a AP fizz, he destroyed our mid kept ganking and grabbing easy kills, but in the end we won was a great game

.. Fizz is better late game if he goes AD and theres not much of a difference early game if he goes AD.
Fizz is great in teamfights because, here let me give you a example.. he raped your entire team cause thats just what any decent player playing fizz does then team fight comes along and this fizz is fed and pretty much annihilates anyone he starts attacking instantly especially your squishies so most of your team will probably go after him first and then he will E and you will all be confused his e will end and he will jump down and hit half your team and continue the rape, it works really well if fizz ults then does his E, cause his shark and his e will hit half the team at the same time
and Lol at you all complaining about Tryndamere..