Vayne's % Max Health Isn't the Problem,....
The truth is, you can afford to have low counterplay on some abilities so long as the counterplay is high on other abilities. She's supposed to be a tank shredder. THAT'S PERFECTLY OKAY.
Vayne IS weak early game, that's a fact. But, she's not vulnerable. She's incredibly safe. Unless she makes a grave mistake, or gets 4 man ganked, she won't die. At best you can deny CS. Especially true with Thresh/Kench running around.
Take a look at a VULNERABLE early game champion. Twitch isn't going to win trades, his only escape can be delayed by SIX seconds (Which also limits his ability to fight back since it also has his only AS steroid), he has no self-peel and his damage output is overall pretty low until he's at least level 6 and initiates the fight with Q and R up.
Vayne is a problem because she has much better access to her end game fantasy than any other end game ADC, and it shows. For the end game she has, her early game should be punishable, and it's just not punishable enough.
I'M NOT SAYING she can't be punished. I'm saying it's not enough. That's her problem, not % max health true damage.
and
go at it.
isn't efficient because she can simply kill the target, and who the hell buys
?
mistake, you say?