No way, the leblanc rework makes no sense. They totally took her out of her assassin role and playstyle. The highest win rate masteries don't even take precision mpen, they take the 5% cdr to get as many rotations/passive hits out as possible. This is not what assassins do, send out rotations of spells from behind their front line over and over. That's a normal mage.
They took away her ability to assassinate and replaced it with (outrageous) damage on her passive which takes too long to go off to actually pick someone off and then get out.
What they should have done is taken a LOT of damage off of her passive, put it on a 1 second timer, moved damage to her ult or something. Plus, made it so it goes on cooldown after hitting someone so she doesnt try to just pop it on all 5 people since that's not assassin like at all
This would also make her less retarded in lane, where if you get hit by chains alone you take 75% of your hp total with her passive