Would it matter if everything Foucault said was wrong?

There is a nice “TLS piece on the new translation of Madness and Civilization”:http://tls.timesonline.co.uk/article/0,,25347-2626687,00.html. It spends a lot of time dissing Foucault’s scholarship, which is sort of interesting if you read Foucault for the ‘theory’ and have been going along assuming that it wouldn’t matter if “everything Foucault said was wrong”:http://www.springerlink.com/content/nh4t51v6u2681102/.