Poppy's ultimate
I have been playing Poppy for a while at this point and the rework is fine overall. My only gripe with it is that her ultimate is too much of a risk, for too little of a reward.
Here is what I mean: The fact that instantly casting the ultimate would cause the enemy to become un-targetable makes the ultimate extremely risky. It could end up turning a fight completely in the enemies favor because of the time it buys for setups. This might not be so bad if only the damage was slightly higher, but I don't think increasing damage would be a good change. Casting the ultimate instantly should heavily slow and reduce the damage of enemies hit. I think this embodies the "crushing" aspect of the hammer, applies some very useful cc, and doesn't give the possibility of completely screwing Poppy's team over. At the same time it doesn't stop the enemy from retaliating the way a full stun would. Both parties have a chance to do something as a reply to the ultimate.