Riven is still broken, Riot
She is a mobile assassin with CC, burst damage, tankiness, and low skill cap champion with no resource whatsoever that will never be fixed without a rework to her entire kit to make her back into a bruiser where she belongs. These ass kissing mains have been keeping her brokenly OP for way too long, she needs to have a rework done since you guys can't figure how the hell to balance her.
Here's a suggestion since you don't want to rework.
- Mana.
No excuse for her to be resourceless. She's a champion with high mobility, burst, CC, and tankiness with that shield of hers. Her CDR are relatively low and it makes for a face roller that throws a keyboard down a flight of stairs to get an easy kill.
- Drastically reduce her shield.
Give her the Diana shield treatment. She is not squishy as long as that thing still scales with AD, she needs to be forced to build items like Sunfire Cape instead of building all damage and suffer no penalty for it.
- Remove the dash of her shield.
It's a shield with an escape that can also act as a gap close. No need for a dash when her Q can already perform the task of escaping and gap closing. It's too much utilization, just as LeBlanc's silence was. This will make it even more riskier for her to be in a team fight than jump in and mash buttons as if the user was in an arcade.
- Ultimate removal of damage steroid
Her passive already acts as a steroid, absolutely no need for more. She isn't an assassin, she shouldn't be pushed as an assassin, yet this very ulti is what fits for an assassin.
These are the things I want done to her kit. She is in another class of her own, she shouldn't be getting any special treatment just cause a bunch of ass kissing mainers want to keep abusing this freelo, and should suffer a large nerf or rework.
vs 
.
Stats-wise, their base AD ratios are the same - however, the tradeoff for that is that Darius has 3x the health regen, almost 5 more base armor and 30 more base health vs riven's amplified mobility. Sure, she can favor short engages all day but she's incapable of standing to trade-off against him
once. I've never been wrecked so hard in my life. I ended up rushing 
just to try to stop the turret diving rape.
See how limiting that is? Wu-Kong isn't built as an assassin often anymore because it's ineffective, Talon's in about the worst spot he can be, in large part due to high mana costs and a small mana pool.
(Edit: Why do they use mana? Every spell they use is guaranteed to hit their target or go off exactly where they placed it. Same goes for LeBlanc on the AP side of things. However, while Kat's shunpo arguably does the same thing - it's a total reposition with zero escapes, unlike the above 3 examples. Her Bouncing Blades also deals reduced damage to subsequent targets hit after the first, making it an unreliable form of harassment particularly in the early game where she has low damage. Riven has no targeted abilities, you cannot point and click anything and with mana, you severely limit her waveclear potential which we see in assassins and top lane picks alike, which brings you right back to where 
and just outscale her.
