i'm sick of playing against vaynes who think that she's a fair champion

the same thing going through a riven who faces a garen, and calls him cheesy and op during laning while dying lvls 2, 3,4,5(so no villain mechanic, no complete items on mr g). pots and kettles.

vayne is not op because not so overpowering that it overcomes their poor play completely.

garen op vs riven because can't stop spin with q and w, so no free damage cheese with no real counter, thus suddenly riven not op enough to cover crap player.

the logic is simple.

I'm sorry, do you ever build boots? Like ever, on anyone?

what makes her not fair? she is outranged (this means overall range not auto attack range just so we're clear) by all the other ADCs, has to get 3 consecutive attacks for to have any damage and is one of the squishest ADCs

The problem most people have with champions usually comes down to them just being unable to adapt to their opponents playstyles and just end up dancing to the enemy's beat instead of their own. Vayne has strengths and weaknesses like any other champion i.e. if you 1v1 duel her, surprise surprise you'll probably lose 8/10 times bar a colossal misplay by her.

Exploit weaknesses folks, she has shit waveclear, shove out bot and siege mid. She has no poke and her DPS requires free-autoing a single target whilst struggling when she has to switch. Fight with your team to burst/focus her down probably with the aid of a root or stun (vision is your friend here). Although people generally realise this too late once they've fed ~10 kills during laning throwing the game for their team and making it nigh-on unrecoverable.

Tl;dr - Leona & Graves/Draaaven to blow away that b*tch. Play the map with your team, let her afk farm bot whilst you take an inhib and then contest buffs/drag/baron to secure the rest of the game. Just send someone to waveclear when she splits but not get baited out only to get rekt up against the turret trying to flee before she takes it down right after thus stifling the progress made by the rest of their team. In short, you don't HAVE to chase after/kill her tbh, unless she's caught out or during a teamfight as she doesn't really bring much else to her team other than aggro by virtue of being an ADC if you think about it.