Le blanc is useless now. No more to say.
Edit: The only one thing good is W+Q AOE damage, but for do that just pick Viktor and you can oneshot people in one second. With LeBlanc you will never oneshot nobody again.
2 Edit: And for that people are saying you have to learn her again to do good with her, is true, but remember the other team either don't know what LeBlanc does.
So you have a little advantage vs them till they realise what she does.
In a couple of months all will know she can't kill you if you are full HP. So i think she is less assasing and more mage champ.