[{quoted}](name=Nova Force,realm=EUW,application-id=3ErqAdtq,discussion-id=edR94dtU,comment-id=0007,timestamp=2016-09-17T01:11:59.433+0000)
Did you play in Season 5? Honest question, she was considered completely absurd in that timeframe. Just because tanks are valued less because damage stats are important doesn't mean someone should stop playing an ADC, especially a good duelist one.
Vayne basically has the best self-peel tools of any ADC, and I'd honestly say she's in a fine spot since she can approach a surprising amount of situations other ADCs can't and come out on top. Maybe you're just not realising her for her strengths? Not every champ should be a one hit wonder team-splitting nightmare like Jhin.
Back before the big marksman update, Vayne was a pretty decent ADC when played correctly. She was never considered "absurd" though and I don't remember her ever being the top ADC in the game or even close to it.
The stats don't lie, she's been at close to the bottom all season in terms of winrate, damage, etc. Being that the people who play her average the most games on her (#1 among ADCS), this is a sign she is not in a viable state. She can't compete early at all but now she also has lost her late game edge to ADCs who can scale with her but also have better range and tools to keep them safe.