Now that we know the Q double stacking w is a bug, these Vayne changes aren't that bad
Her Q bonus damage can't crit anymore so she can't ult, press Q, and then do 100% of a squishy's health with 1 auto and her W got buffed so she does more damage against tanks. Being moved away from a squishy buster to a tank buster again. Her ult changes might be broken idk, but the other changes aren't that bad. Could be a lot worse.