Have we forgotten about Fizz?

Hi, I'd like to set up a discussion about this little fish guy. With so many balance issues being treated, I think we've just forgotten how Fizz numbers are Insane. I mean, I realized this after I got one-shot as Volibear by a Fizz. I was clearing my blue buff, practically full health and suddently a lobster runned at me; Fizz just invaded my jungle, jumped over the wall and took my whole health bar with just one combo ( I had like 2k HP, 3 kills with Tank Masteries and he had Magic pen boots and abissal scepter with 4 kills). Later in the game, he just invaded my jungle over and over again - I could do nothing, he would one-shot me anyways and my teammates, even the Shen, couldn't do anything because they would get one-shot too. I was only able to survive after I got Sterak's and Spirit Visage. Is it ok? I mean, this guy should be an assassin designed to wreck carries and he can simply kill anyone that doesn't build a overbearing amount of MR with just one combo.