The biggest nerf fizz needs
When fizz gets a little ahead (especially if you're squishy and even more so a squishy melee) he can kill you even if you never leave turret insanely quick with zero risk. Even early levels and especially at 6
This phenomenon is compounded on fizz by the difficulty of ganking him due to the same tool that lets him dive without risk. A lot of jungles won't waste time gankinh because fizz is so slippery. He also has great CC/burst/engage/scaling so jungles love gankinn for him.
Now here's where things get rough. His early game is somewhat weak and you CAN pOKE HIM down. This will shove the lane. That means you're probably going to get ganked, which at the least will relieve his pressure and allow him to scale safely. If he gets an early kill from the ganks in favor of him (and due to his nature they will be (hidden power) and good farm, you will be pinned under your turret in fear of his amazing burst and engage which has huge range. So you hide under turret.
Here's where the next big problem lies. Fizz can w>q>aa>e away under your turret and cleave a HUGE chunk. HE ONLY needs to do this one or twice before he can all in you. Due to his E this is all risk free and your turret may as well not exist, he is the ONLY champion in the game That can do this.
Meanwhile he has denied you all that farm with no risk and will continue to destroy you. I know you're thinking "have your jungle help." but that's a temporary solution and will just delay the inevitable. If he's ahead and you're squishy you may both die. Or he'll just roam bot and snowball that lane. You probably won't kill him so it's a huge waste of time. Most jungles barely look twice at a fizz lane for good reason.
Also he has awesome no risk potential with all that mobility. And you won't be able to shove out against him without facing his engage and burst.
So to shut him down you have to shove, but it's unlikely you will kill him. It becomes likely you will get ganked then and it doesn't take much for him to scale.
Due to his nature this is how things boil down and I'm okay with most of it, except for the love of god PLEASE
Make it so turret shots go through his E so he can't dive all day. sure he has mana issues, but once he's 6 with a slight lead or even youre probably not leaving your turret depending on who you are (most mids) so he shoved the lane mana free and combos you under turret taking zero damage until he kills you. There's not much you can do here.
And for the record fizz is one of the ONLY champs that, if he builds seekers armguards and maxes Q can miss his e, miss his r, and still all in a yasuo and kill him with just W and Q. Don't tell me that's a weak early game. And he can abuse every single squishy mid in this fashion. And due to his kit it's very like to happen... There's a ton of hidden power in his kit (unlikely to die or be ganked and immune to turret shots.)
At least start by taking away his turret immunity so there's some counterplay and he's not as obnoxious to play against. Hiding behind your inner turret is not a real option.
And again fizz doesn't need a huge lead to do this, he needs a sheen and maybe boots 2000 gold. Thats first blood and 50 farm (6 or 7 minutes into the game.)
I didn't even get to how this all influences his immense roam potential where you lose all of yours because of his engage and burst so you can't just CS or shove happily mid lane.
But this is all also very likely to happen, because to shut him down you must harass him early which will probably shove lane and one mediocre gank will kill you (especially before first back.) then he's killing you under turret. also if you let him play aggressively instead you're gonna have a bad day.
That is all. If I'm bad that's ok. I THINK a lot of people feel this way about playing a fizz lane. Starting here might ease some of the hatred.
Remove fizz turret immunity on E 2015