I don't like the new Kassadin, because he has no way to actually stick to his targets anymore.
His insane range on his ultimate was supposed to help him out with that, because he had barley any cc to stick to an target (his e needs to charge before he can actually cast it) Making him already horrible as an assasin. His Q silence was supposed to help him to stick to his targets, so they won't actually use their mobility spells, while his E is on cooldown, yet after the silence remove, he's only there with his ultimate and his e. Now after the other nerf, he's not anymore an treat for anyone, he's barley ranged, has almost no mobility, and his ultimate feels not more like an ultimate.
Riot seems to not see that there are champions with higher mobility with lower costs. Look at Leblanc as example. She has to pay at max rank about 100 mana, and she can travel 1200 units with it (dash + blink) and just add the ultimate distortion too, making about 2400 units. She is an problem champion, I main her and she feels incredibly unfair after mastering her with the silence remove, yet there can't be a delay before leblanc can blink back to her original position, otherwise leblancs only way to trigger her sigil in lane would be removed.
Yet I'm wondering; Why is Leblancs mobility not seen as problem while Kassadins is? He has to pay more mana than Leblanc has to and this is where Riot begins to contradict themselfs. If Leblanc is allowed to be mobile, Kassadin has to be too.