Vayne is some Grade-A Bullshit.

The fact that someone can have zero defenses, and not even have to build anything, is beyond bull shit. Combined with her extra damage, crits, BotRK currenthealth% damage, and total self-peel + an AD steroid and stealth to stop AA's mid-animation and totally fuck with your enemy ADC whilst damaging the shit out of them, as well as utterly annihilating every tank in the game as easily as any other champion... its just... disgusting.

Seriously, I cannot tell you how many times I've played a game with Vayne, on my team or the enemy, that she's lost lane, hard or just barely, then anywhere past level 3(whether it be level 3 itself or level 9 or level 18), just destroyed the enemy ADC. She's one of the only ADC's to have a hard-CC which isn't an ult(there's also Jinx, who has no mobility and can be defended against, Caitlyn, with a long-cooldown spell that dashes her about the same range as Vayne's Q and slows the target, still has defenses and her CC is extremely hard to land and obvious to avoid, and Gnar if you're actually going to count him as an ADC which he technically is labeled as a 'marksman', and even then its only in Mega-Gnar form), to add the only one with targeted CC that isn't extremely easy to avoid, and also is a stun and not a root, she has a dash on a 2-8 second cooldown(2 seconds after using the AA buff given from it, so possibly every 2 seconds she could dash, and with her ult, stealth).

Think about this: Vayne cannot be defended against on her 3rd hit, 2nd if she's a jungler and has Sated Devourer, every hit with BotRK can only be defended against by armor, and with that meaning you have to specifically build armor to defend against 2/3 hits from Vayne, maybe even if the rest of her team is AP. And now you're lacking the damage to actually kill her in the first place. So, with all those undefendable hits, and %currenthealth damage, Vayne can go in on anyone that doesn't have a point-and-click CC(only a few champions in the game, the only ones that come to mind are Taric, Teemo, Fiddlesticks and Malzahar), even then, and when they try to AA her, she dashes away in stealth(assuming she has her ult) and cancels that attack, and if they're melee making them having to run back up to her, then 2 seconds later can dash again, possibly canceling an AA or getting away from a dash, do it again, and just constantly reposition without them even knowing where she's going. So they not only get their AA's canceled, but they have to LOOK for her specifically. They have to know where she's going to move their mouse even close enough to A+click, let alone just normally click on her like most people do. You could say "put down a pink ward," or "use an Oracle's Lens," but not many people have one of those on them. In high-elo like Diamond+, maybe Platinum, a lot of people will have Oracle's Lens, but anything lower most won't, plus there's usually one person that takes a ward trinket instead to ward with the support. And anyone who doesn't have it, has to have a pink ward. Its not even guaranteed they'll have a pink ward because they might not have the room, or they might have used it already to put it somewhere. Even if they do happen to see her, even an averagely-fed Vayne(normal CS, maybe a few kills and assists) can generally 1v1 any champion. Heck I've seen Vayne's 1v1 a Tryndamere simply because the Tryndamere can't actually get to them before she kills them, then when they run, she just constantly dashes at them and runs with her increased movespeed by that bullshit passive.

The only way I can imagine beating Vayne is to be either A. Jax, B. Teemo, or C. Master Yi. Jax by ignoring most of her hits with his E, and anyone who's not stupid will just run the fuck away, Teemo with his blind, again, will just run the fuck away, and Master Yi with his tons of attack speed and movement speed plus his gap closer allowing him to, for the most part, stay on Vayne and kill her within 4 or so seconds allowing only one or two dashes and stealths. And then maybe a few point-and-click burst mages like Annie, and even then if Vayne can CC her fast enough its done.

And that isn't counterplay. Give this woman counterplay. NERF THIS SHIT.