He does not deal more damage than before, lol. Not even close. He deals it in bursts now, which makes it seem like more, but it is a lot less. I have 200k mastery on fizz, but I played MUCH more fizz when the mastery system was not in place than after they implemented it.
His w passive used to do a shitload more damage. A ridiculous amount of damage was taken from that. the bleed is never going to be more than ~300 now. With the missing health and old ratio and such, you could reach values of 600-700 over a shorter period of time on low health targets. They also reduced the ratio on this.
His w active was changed so if you wait 2s, the damage triples now. That's 100% of his ap, plus a decent base damage. Old W active was 6s of his autoattacks having 30% of his ap + 30 damage. If he got off 4 autoattacks during this time, he did more damage than the new W active does now (probably 3 with ult amplification).
His ult was severely nerfed unless you land the gigalodon shark. Even mid range shark has less base damage and a weaker ap ratio than old shark that you could point blank with. On top of all this, the shark no longer gives +20% damage amp to all of fizz's abilities, so it was a net nerf to his entire kit. This change fixed most of the toxicity of his kit and made his engages risky, telegraphed, more dodgeable (Even the large shark latch radius is better than q/r combo), and more focused on burst than sustained autoattack damage.
Go on though, whip out your anecdotes about how you were playing a marksman/mage and how it's not fair that fizz killed you in one rotation.
LuL
I think you have absolutely no idea what you're talking about and are bad based on your reply.