Yet people are going to continue to whine about how their assassins can't always win against the ADC even when the ADC has a full team protecting them or is super fed.
He's 3 levels higher, has baron buff, rift herald buff, who knows how many dragon buffs, and has 15 kills versus a Varus with zero health or defensive items. If these champions were on equal terms and he did that then that's a whole different issue.
People seem to not realize that the time to counterplay assassins isn't late game, it's early game, and then all the game. If you don't let Rengar kill you (AKA PLAY SAFE, WARD, BE MAP AWARE) for once in your life, he might not be ridiculously fed by 10 minutes.
I mean, you are quite fed and varus was level 14, and when you killed him, he was worth 117 gold. He's just seriously behind.
It is just Rengar that they overdid with his ridiculous spammable Olaf Ultimate and 30% (42% if there is a Kha'zix for him to kill) bonus AD.
I've found that most, if not all, the other Assassins are fine.