A very predictable analysis from a rush down fool's perspective.
A top tier character's corner offense is superior to Quan Chi's vortex. In the corner, Quan Chi has to guess between pressure strings, staggered pressure strings, overhead attacks, low attacks, and throws, all of which lead to more offense. Watch Foxy versus Mike as the most recent example, even though other characters have even better offense on Quan Chi than Kung Lao.
The reason you rush down fools keep making the claim that Quan Chi is so broken is because each night before you go to bed you pray to Paolo Garcia that he is normalized. Why will none of you have some decency for once and make this admission?