ISIC used to feel tanky. Perhaps he has the same theoretical defense as the other tanks, but there is a catch. An oversight in this latest patch is that ISIC is 2-3X as large as the other tanks. He gets hit by EVERYTHING thrown at him. Especially when his wards are up.
His damage output in PVP has always been decent, but after a week of the game being launched people had not caught on that all you have to do to WTFPWN ISIC is CC him by literally anything other than a slow and he will drop his Ult.
Feel free to discuss but I doubt the Devs are reading the forums.