To everyone currently complaining about Vayne
Vayne is mainly really strong because all of her lane counters are weaker and not as viable right now.
After worlds we'll be getting the marksman itemization rework, along with changes to likely a number of marksman. I'm nearly 100% sure that after those changes, Vayne will either be less powerful or more likely her lane counters will be strong enough to deal with her again.
It'll be fine, just be patient and in like 2 months or so. Riot needs time to do stuff, and the worlds patch needs to be stable after all.