His burst is pretty bad unless the ult is up, and his Q is hard to hit against an opponent that knows what they're doing unless paired with other better CC. His ult can also be hard to hit without CC to back you up.
So you're left with W as your only truly reliable damage, which has a kinda long cooldown.
Basically unless you feed him you can kinda ignore Cho'gath if you're good at dodging his Q. He doesn't have much beyond that.
--
No problem!
This is a cute and pop genocide of love!