Yes, Garen.
A tank shouldn't have that much health regen. If he gets away he's full health in a few seconds, his E deals Big Boi damage and lowers your armor, and his q is Big Boi damage with a silence, W makes him take no damage or cc. Executions shouldn't be on tanks.
Illaoi E is easily avoided ONLY if there are minions. And she can go into bush and while you are unsuspecting, just E you. Her ult is NOT easily avoidable. Tentacles pop up from every direction and instantly slam and keep slamming you when she W's you every second.
Morde can stay on you with ease. He's got an E to pull you back in, Ult to make sure you can't get away, and if you are melee like most top laners are, you have to get in close to fight. Exactly where his passive is.
Rumble Q can't be avoided. He has several slows, and a speed-up. His Q does as much damage as an Ult, and he can stay on people easily, meaning its hard to get away from it.
I rest my case. They are not "easily avoidable".
Bruh Azir isn't OP at all...
But yes, Veigar infinite AP stacking is OP, especially since he has REALLY high scalings, and an execute.