THIS IS WHAT I'VE BEEN SAYING SINCE I STARTED THIS GAME. Finally, someone agrees that things are wrong. Assassin's relative safety and ability to delete opponents is absolutely obnoxious. Zed can kill you from miles away. Leblanc can kill you every 16 seconds from the other side of the creep wave, meaning that her lane harass is a 100-0. Ahri I haven't honestly had too much trouble with except for her charm where if it hits you your options are either a) hope and pray that you can flash away when it ends, b) die, or c) die and have your team try and save you, only to die themselves.
Gragas I haven't had much trouble with. He seems pretty telegraphed and I can avoid his ganks pretty well unless he ults me well. Cho'gath is a high-punishment champion where misplays against him are absolutely devastating, but his lack of mobility and weak bulk compared to other tanks isn't too bad for balancing purposes.
Volibear, on the other hand, is clean unBEARable to lane against. He can constantly dive me with his run, deal a load of damage, and then leave with little room for punishment, especially with a melee top-laner. I call in ganks, but unless they have serious mobility and repositioning tools, Voli just throws them and can get back under his tower without a second thought. It isn't fun to play when you have no control over your own actions. When Voli constantly throws you so you can't farm safely, that's unfun. When Assassins 100-0 you so you can't play at all with your team flaming you, that's unfun. CC as your excuse for making overloaded champions is wrong and poor game design.