Cho'Gath is a necessary evil
For those who want Cho'Gath nerfed because of his true damage, knockup, silence, and assassins levels of burst while being very tanky:
He is necessary to keep abominations like
in check. Otherwise they would probably dominate mid lane again. Cho'Gath is unfortunately one of the very few counters to assassins that we have, and one of the few mages who can properly deal with them in 100% of situations.
Also, due to his passive he is one of the few mana champions who can keep up with Zed and Kat's constant ability spam.
I fear what would happen if Cho'Gath was nerfed. He is the only reliable counter to Kat that I have.