User blog comment:Deshiba/No counterplay/@comment-12314620-20140515204418

It's easy to understand why Riot chose to give Malphite and Hecarim cc immunity during their ultimates. I mean just think how unsatisfying it would be to the player when your ultimate gets cancelled by a stray Janna tornado. Vi might be somewhat a problem in her current state, especially at lower elos where teaming up is difficult and people tunnelvision in teamfights.

I think there's a slight misunderstanding with the way you understand counterplay. Kassadins problem was that after 6 his gameplay pattern was extremely frustrating for pretty much everyone. The immense mobility was a big factor with his problems (so sick roams), however his gameplay pattern was practically "Teleport in, Vomit skills over them (1 point and click, 1 huge aoe, practically impossible to dodge) and the target was either dead or not", and even if he/she wasn't they would be stunned and not be able to use their own kits to counterattack.

If Olaf ults you can still fight him. Depending on your champion you might have better or worse chance, sure he is strong against cc reliant champions but say Ezreal (on anyone with some mobility in their kits) can still escape him just fine. Poppy is considered toxic by riot and the way I understand she's waiting for a rework. Nidalee and LeBlanc nerf/reworks/number changes have been confirmed by Riot. Xerath was reworked to allow him to have more power and make his ideal scenario more interactive (getting blown by QRRR by fed old Xerath from fog of war was pretty stupid, this is why his numbers were forced to the weaker side. Skarner was not reworked because his perma slow was no counterplay: Riot wanted to tweak him into a state where he would be someone worth picking into a comp: Yes they might've failed but at least they have not given up on him. Karma does not have perma slow. Most champions who have (GP, Ashe, Zilean to name some) are kept weak partially because they have access to permaslow.

PS: You forgot J4 from your list of Unstoppable abilities