Why the assassin class is inherently broken

It doesn't matter which assassin it is. Assassins in general are toxic to this game. Most of them jump in and poke you, and then have some sort of safety in their kit (stealth, blink, etc) that lets them escape after poking you without taking (or taking very little) damage. And even if they fail to secure a kill, their base damage and/or scaling is so high that they peel better than other champions (like mages or bruisers). And you can have more than one of these champions on your team. Yes they are squishy, but as I stated earlier they peel so much for their teammates that the squishiness is irrelevant. And they're not really squishy at all, since they all have something that helps them survive in teamfights (Fizz passive lets him take reduced damage from auto attacks, for example). In short, lots of assassins need massive nerfs to make this game more balanced. They are crowding out other picks and are overcentralizing in almost all game modes. The tank meta is a joke. There are a small handful of "tanky champions" (like Sejuani) that are really strong right now, and those champions were made even stronger with the introduction of cinderhulk. But most of the "tanks in this game" are no different than they were before cinderhulk, which is average at best. And, of course, tanks aren't allowed to have damage, so if you ever die to them if's your own fault. You either didn't have enough wards of you had REALLY bad positioning. TLDR, assassins are strong, tanks are not. Tanks offer nothing but CC. They don't peel for their teammates. Assassins peel. After an assassin ganks you, I can almost guarantee you will lose more health than if a tank ganks you.