I know you are being a QQing troll, but I want to point this out for the non retarded viewers of this post.
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We removed his reset early on because it wasn't healthy for gameplay to have his ult up all the time
He also has the tools to reliably kill every melee while building tanky thanks to his base stats and inbuilt armor pen + mixed damage and true damage. He easily killed you in lane, and could then do the exact same thing 40 seconds later. Riven as far as I know does not have a 60 second ult at level 6, or brutally dominate most melees (assuming equal skill).
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We nerfed his early game since he was already had a great late game
He was also winning early and ignoring his weak moments entirely. He was already amazing lategame, but was doing great early to and thus was nerfed. Riven by comparison is meh early and mid unless you fed her and meh late unless you either fed her a lot or don't focus her at all.
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We removed their silence because they could jump on you any get their combo off before you could react
Their silence was removed because it was a point and click long ranged CC on a champion that normally did all their damage in ~.5 of a second then ran. That meant your counterplay was limited to autoattacking, running, or hoping you survive their entire burst combo. Riven does not have point and click instant gapclosers or the burst of an assassin.
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We removed his ability to get a shield when ward jumping just so we can say we nerfed lee sin since everyone is crying about him. Also we took away his AS slow on his E so it'll seem like we nerfed the core problem with Lee sin.
First, Lee still gets a shield when ward hopping, but the ward does not. That was because shielding a ward made it effectively invulnerable for the shield time as it still only took 1 damage from autoattacks but had a several hundred health shield. Second, (thank you people who pointed out this was wrong). Tthe AS slow nerf was rather huge, as it meant Lee had less dueling power and was thus riskier.
Second, Riven's nerfs were rather noticeable; the hp per 5 means any damage you do to her will stick, while the shield cooldown nerf means earlygame baiting the shield (or just waiting a second for it to go away) gives you free reign to punch Riven. Otherwise, AD scaling is not a bad concept or even extremely strong, as unless Riven has magic resist or armor to go with that shield is just empty, squishy health.
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We dont like instant stuns
Veigar had an instant long ranged long duration stun (2.25 seconds, which is the highest AoE hard CC I can find). As much as I love Veigar, that stun was extreme bullshit to face and had the counters of "buy merc treads and banshees veil" and "never get within 1050 range of Veigar". Riven's stun is an AoE .75 second stun in melee range, which is hardly comparable to Veigar's ultimate tier E.
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We like the fact you're a cc heavy tank but you're dealing a bit too much damage..nerfed
Sej was nerfed because going full tank still made you do sizable damage. Riven is not because A) she isn't tanking your team for several seconds while outputting great DPS unless you really fucked up, and B) Her total CC's go to almost 1.5 seconds. CC fucking heavy? Garen's friggin silence is a longer CC than her entire kit.
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We gave Garen long cd's to balance out him being resourceless
Garen's base abilities are also pretty powerful; slow cleanse + point and click silence, permanent 20% bonus resistances and active tenacity + damage reduction, AoE physical damage that can crit and an execute ultimate. Buffing his cooldowns would lead to some rather unfortunate times (lower Q? More silences and screaming demacians. lower R? You get to the Darius problem). Riven's cooldown are rather low LATER IN THE GAME, but early game her cooldowns are still rather large and give her rather open windows to be attacked.
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We had to tone down Akali. Once she got a kill she snowballed way too hard
She also snowballed with a long range point and click gapcloser on a champion that survived and won mostly via outstatting you. You either died to her burst, or didn't and then killed her since she so nicely served herself to you. Riven does snowball rather easily and keep the leads well, but she also still needs to waste her damage or defence to get close to hurt you.
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We just flat out don't like you guys. Too hard to balance
Really? How do you properly balance permanent invisibility or a true damage dealing, high damage CC immune dude with a slow? Buffing either of them creates pretty toxic environments as parts of their kit are extremely difficult to balance around. If Eve gets more damage, she's a threat due to being invisible and exerting pressure on the entire map at once. If Olaf gets more damage, he's a threat because the only peel you can provide is killing the dude or running as soon as you see him.
Riven's kit is comparatively easy to balance. Is she doing to much damage during her CC's? Lower her damage a bit or lower the duration of her CC, or even nerf her stickiness a little so she needs to be closer to go in.
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Well, you see Yasuo..your shield is making you too tanky. We like the idea of you being a hyper carry but with that shield of yours you are just too tanky to have that type of damage and overloaded kit
Wow, it's almost like Yasuo was literally pick ban for several months after release and had literally everything about him nerfed! Shield wise, it got nerfed in duration (so autoattacking him meant his shield was down, not that he could leisurely engage on you with his shield still up) and the total amount was reduced a large amount (by 180) to allow you to break through if need be. Weirdly, it's almost like Riven's shield is ALSO really short in duration and around as strong, total strength wise, as Yasuo's passive. Only thing better is Riven's comes with a dash and has a lower cooldown.
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And yes, to those of you who constantly see these threads by me. I hate Riven. I despise her with every fiber in my body. I know the Riven mains will down vote this because they can't accept the fact Riven is overloaded as shit.
I don't really play Riven. But your entire post is mindless QQing, so I downvoted for that.
"I mean you can just buy armor!"
I'll buy 
Because one 2300 gold item that only gives you 35% armor pen completely invalidates armor, right? Not like she needs cooldown reduction or lifesteal early, or that your armor still protects you.
"Well, you can always get 3 armor items"
Well, I can always get 
Because adding an extra fucking 20 armor penetration gets rid off 2 entire items worth of armor, right?
"Get 6 armor items!"
Nigga, I already won the game.
That would be because you afk'd to QQ on the forums, or maybe because you decided to not peel for your team against the squishy melee.
"Well, fuck, guess we have to ban you"
Can't,
already took up the very small amount of bans we get
Obviously you don't actually hate Riven that much, seeing as you won't make room for a supposed champion you "despise with every fiber in my body".