Don't let all this preseason hullabaloo distract you from the real issue...
That Cho'gath can become an unstoppable unkillable monster with basically infinite health and insane resistances, building literally only tank items, and can still one-shot most carries by pressing 3 buttons, then shrug off all the damage you deal to him trying to stop him from doing so by staying out of combat for about 5-6 seconds, then come back and continue to knock up, silence, and slow your whole team to oblivion.
Pro league casters, pro league players, and dozens (if not hundreds) of people on these boards have all mentioned that there is absolutely ZERO counterplay to a fed cho'gath, other than forfeiting the game or hoping your team can win the game around him.
Post 25 minutes, Cho'gath charges at you at 100mph with righteous glory, slows your whole team, activates stoneplate, and does 2000+ true damage point-and-click. All while being absolutely unkillable unless your whole team focus fires LITERALLY ONLY HIM with ABSOLUTELY EVERYTHING for a solid 6-10 seconds. Add The ultimate hat + Transcendence on top of it? If you're feeling REALLY froggy, add Cosmic insight + magical footwear + swiftness boots on top of THAT? There is no escape. One of your carries is going to die. Period. There is absolutely nothing you can do to stop it. God forbid he's fed enough to have built rylais on top of it all too, for the slow on his W, on top of the slows on his E and Q already. "just kite him" yeah. Ok. Righteous glory + 3 in-kit slows. Kite him. Sure. Plus slow resistance from swiftness. Or what about the tenacity summoner spell rune + the tenacity "legend" rune + merc treads? There is no kiting a fed cho'gath. It just can't be done. Not even accounting for the flash + R.
Inb4 "don't let him get fed" and "play faster games" and "kite him" and whatever other 'get gud' bullshit people want to say about it. The fact of the matter is that it CAN happen and it DOES happen, and its happened to probably everyone at least once or twice by now, and it cannot be argued that it is absolute cancer to play against.
I almost feel guilty even playing it. Granted, most games I'm just a champion with a pretty threatening ultimate and some CC - but in those few games where I get hysterically fed? Good god... its just dirty. Its disgusting. People routinely type in all chat "Wow. 1900 true damage. Fair" or something similar after they get nommed.
that's just not true. I've seen pro players pop plate and literally walk up to an enemy adc and one shot them with a true damage. That's not healthy period. Sure, that might be a rare occurrence but the fact remains that it's possible while being extremely tanky where you have to focus him down over higher priority champs.