Riven feels terrible right now.
The only slightly optimal path now is running electrocute and being forced into full lethality Assassin Riven.
(Cheesing out lane with aerie too I guess but that doesn't scale well...)
Without Fervor bruiser Riven does nothing, and press the attack is honestly awful because of her spell weaving, after she actually manages to stack the thing her Cooldowns are all up and she has to back off.
As well losing the 10% early game CDR also feels absolutely awful and it takes ages now to reach the CDR cap on a champ that relies on that to operate.