Brake rotors often outlive the car they're in. There's no reason not to assume this was due to faulty manufacturing. It's not normal wear and tear, nor something that "just happens" even under high performance track driving.
That said, ruined in 2000km is ridiculous, certainly a manufacturing defect.
That's laughable. I have to replace rotors on a semi-regular basis. It's absolutely normal if you drive your car hard even on the street.
He turned out to be right: I only recently replaced the rotors at 150,000 miles whereas at 100,000 miles, my Saturn and Ford had already had at least one rotor replacement. Since a lot of people will get a new car before the old one hits 100k, they may think of rotors as something that never needs replacing.
OTOH: those Nissan rotors were an absolute bitch to get off by that point. I was wearing hearing protection while wailing away at them with a 5lb hammer for at least 10 minutes each before they came loose.