Nerf Rivens ult damage and I'll be fine with her kit.

Riven has ridiculous burst damage but then she's out of mobility/damage spike for a few seconds, giving an opportunity for someone to outplay/kite/burst her and then beat her. Her ult can then bring someone, who somehow managed to survive her burst, from anywhere below 50% health to death. And if it wasn't bad enough, it's actually ranged and AoE.

This is the excact reason why fizz is commonly called broken. The point of being a bruiser/assassin is to get someone from 100-0 as quickly as possible, so giving assassins like riven and fizz %-missing health damage is absolutely ludicrous.

I'll be fine with any buffs to the rest of Rivens kit as long as her ult gets nerfed in some way. Please riot.