I have noticed that ADCs can't really deal with tanks anymore, not even with Last Whisper.
I was playing Caitlyn last match, and there was this Shen against me.
I bought LW just for him, but by my surprise, even with criticals, I did close to no damage against Shen.
My critical strikes did 256 on Shen, and that's with ~200 AD and Infinity Edge.
Seriously, isn't Last Whisper supposed to give us some damage against tanks? Cause right now I see no changes.