Even before I read Lebrecht I never really understood why people fawned over Karajan so much (and still do). Even though Lebrecht obviously has it out for Karajan's legacy, if you take away the more inflammatory tone of his writing, the basic elements of what he has to say still seem solid.
Despite all of Lebrecht's writings on Karajan, I haven't noticed that it's made much of a dent in the overall attitude towards him. His recordings still get highly recommended on other message boards, and most classical musicians I work with either don't have the time or care to weed through five interpretations of a piece and identify a Karajan recording as being slightly more artificial.
Still, I haven't yet heard a reason to buy a Karajan recording.