If you wanna just complain about her being beat up by Catwoman then fine, I agree.
But I'm pretty sure that you pointed at WW84 as an example of Cheetah being weak, which is the part I find totally ridiculous, because Cheetah has never been shown as stronger than she was in WW84. Faster? Sure, she has been faster. But not stronger.
And I think the argument that Cheetah is super strong just because she can throw around Diana, is invalid. You yourself have admitted that Diana's strength is volatile, so why would Cheetah be any more consistent?