HATH ANYONE SAID ANYTHING AGAINST JAGUAR???
Ok, to get serious again: Yes, back in the good old days ;-) Karmann Volkswagens were known for rust, especially the Karmann Ghias (aka Secretary's Porsche), but these days are long over.
Karmann has built up a superb reputation in the last 25 or so years and all cars built by Karmann fully have to meet the standards of the marques they are built for - and sometimes one can hear that the cars built by Karmann are superiour to the cars manufactured by the marques themselves.
Juergen P.S.: A Jaguar never rusts, it only gets patina ;-)