[{quoted}](name=Penguin Eclipse,realm=NA,application-id=3ErqAdtq,discussion-id=qfz3H4Ao,comment-id=00000001,timestamp=2015-09-29T22:36:56.951+0000)
I don't know if I would call that significant. Most Vayne's don't really start trading until lv 3. At which point this 3 AD reduction is only 2.5 AD. With armor taken into effect the actual AD reduction against champions is even less. We are literally talking about ~2 actual damage. A slight change in runes or masteries can easily make up for this nerf from the get go.
I would call this a pretty insignificant nerf.
It's a start, so they can test - that's how the PBE works. If they find her curve is still too high, they will diminish more... or they will come to the conclusion that it's not her values at all - it's just that people don't know how to play against her (As her lower WR in Plat+ shows) and leave her untouched.