I can’t speak for the OP, but a “rotor” can mean the brake rotor on a disc brake, which can warp due to excessive use/heat. They are common on most cars, and usually need to be “turned” (ie. machined to be flat) when they are out of tolerance.
Sure, quality has gone down, but, well, that's why it's not worth turning them anyway.
It probably strongly depends on driving styles. I also trust OEM metallurgy far more than anything you can purchase off Amazon.