A friend was at a parts store trying to buy rotors, he had them put the 'new'
rotors on the turning machine to true them, none of them were true, so much for quality control, when buying rotors, have them turned!

 

I used to turn rotors in a shop and I concur with the "new and warped" but it used to be rare.
I bet this happens more nowadays with chinese crap

 

Yep, they turn em and stack on top of each other, sad that not every part store has a brake turning lathe, so people just toss that crap on, I was thrilled my 73 E100 was able to get the drums turned, didn't have to buy any Chinese crap, aside the several poor functioning master cylinders.