Her stealth is the only thing that's breaking her right now. It's unreasonably overpowered and that's pretty much all I have to say. Other than the fact that I don't think anyone should have stealths on a 1-2 second cooldown.
KaRniVooL131 voteslol cry about vayne with a 50.68% win rate
but 
has a 53.05% win rate for 1st among adcs
vayne is 8th
Chamuel851 votesor if she tumbles, with 2 items she can do 700 damage to a squishy at around lvl 9 or 10
Brain Errör 4041 votesIt's on a 3 second cooldown no matter how you look at it. It's only 2 seconds IF you go 40% cdr. And that's throwing an Essence Reaver into your build which isn't exactly an optimal item for Vayne.
