Clive James in his great collection of biographical sketches, "Cultural Amnesia" said it best (p. 676-7):
"The means scarcely existed for anyone--philosopher, philologist, literary critic, journalist, or clinical psychologist--to point out the truth which has since become steadily more obvious, even if it does not appear axiomatic yet: that these two men, Heidegger and Sartre, were only pretending to deal with existence, because each of them was in outright denial of his own experience, and therefore had a vested interest in separating existence from the facts. Will it ever be realized that they were a vaudeville act? Probably not. Even George Steiner, who can scarcely be accused of insensitivity to the historical background, persists in talking about the pair of them as if they were Goethe and Schiller. Those of us who think they were Abbott and Costello had better reconcile ourselves to making no converts."
The predictive quality of this analysis shows just how on the mark the wily Aussie was, putting the above into print two years before this latest kerfluffle. And made all the more delicious by the clarity and liveliness of Mr. James, writing in a style that shows Heidegger and Sartre's offerings to be the rhetorical equivalent of the Mississippi River, turbid and meandering.