Assassins don't do more damage than they should.
When mages and ADCs took a big nerf, for some reason Riot nerfed their Armor as well. That, with a combination of the new AD version of Deathfire Grasp (
) makes assassins overloaded.
Admittedly, Rengar and Talon do need nerfs, but everyone else has fair damage.
Riot does not need to decrease damage in the game. They need to up everyones resistances/hp in general. Tanks items have been stripped of their power and tanks have been nerfed. Example: Sejuani is one of the worst junglers right now when she was S tier forever. And remember when Warmogs had 1000 hit points? When Frozen heart and Thornmail had 100 armor?
Quit pointing fingers randomly when you don't know what you're talking about