I beat a riven in lane last game, so don't say you are making this because I'm mad I got wrecked. But Riven needs nerfed.. I'm sorry. She has more mobility than any assassin can dream of, her damage can be matched by nothing else, her shield scales off AD for crying out loud, she has no mana or energy given her insane sustain. Please just disable her until you find the time to fix her. She is annoying to play with and against. Thank you.
Wat.
She has about as much mobility as 
, its just spread out in 4 dashes rather than 2. Actually fiora has more. (fiora has 2 600 range q's for 1200 distance, while riven can only go 1105 With Q and E)
Yes her damage is high, but its not any higher than Leblancs, Ahri's or Even Yasuo's. She is a fighter/assassin. its supposed to be high.
WOW A SHIELD THAT SCALES OFF AD? THATS TOTALLY BROKEN, cept it isnt really since it only lasts 1.5 seconds.
Most fighters dont have high mana costs, if any anyways, plus her HP regen is basically non existent.
Now yes, downvote me. Because Riven haters are pretty mad about it and dont think about other peoples opinions.
Mobility is a problem. Targeted mobility is more fair than untargeted mobility, as you are using the mobility to close gaps, not create them.
So saying that Fiora is comparable to Riven, when she does not have CC or even half the tools Riven has, is something completely idiotic.
The problem with Riven isn't her dashes. There are plenty of champs more mobile than her. 
laughs at Riven's mobility.
Her problem is her entire kit as a whole. She's rewarded very strongly for playing like a yolotard. She builds all damage, snowballs insanely hard if she gets a kill and is very, VERY easy to use. She caters to the sorts of players who want to chest-thump in top lane all game and only really care about kills. BAD Riven players can snowball into teamfight-winning killing machines if you make a mistake against them. Riven players who actually do play strategically, understand objectives and the like are even worse. She's also safe enough that punishing her for her mistakes is tricky due to how well her kit lets her win duels and turn around fights. The only thing she lacks is sustain... but she's an AD champ who builds damage so something with Lifesteal is almost always one of her FIRST purchases, negating that weak point very quickly.
All-in-all, she's too Bipolar. If she gets ahead even a little you can't go near her ever again and she can tower-dive you to death at her leisure. If she falls behind she's almost entirely useless due to how much damage she needs to build to stay relevant. She lacks the utility of other bruisers who can get away with falling behind by building tanky and helping their team that way. A no-damage "tanky" Riven is both sad and hilarious.
All she really needs to make her less obnoxious is a decrease in her early game power and perhaps a slight INCREASE in her power if she's ahead. Champs who snowball as hard as she does tend to have weak early games, making getting to that point the main challenge of playing them. If Riven wants to AoE her way through teamfights getting quadra kills once she's ahead... make her work harder to get ahead.
I wish Riven's Q also gets affected by slows as well. It's not fair to champs like Nasus or Malphite to unable to catch up to her with all those QE slow-free mobility.
The problems are actually two:
