After reading the opening chunk of Camus's Myth of Sysiphus (albeit only in the Justin O'Brien translation, which is a literal one (sounds very stiff e.g. translating "époque" with "epoch")) I maintain my conviction that he was a pseud.
Here is my evidence, taken from the Penguin Modern Classic edition pg. 19 (yet re-edited for clarity):
From the moment absurdity is recognised, it becomes a harrowing passion. Let us recognise and enumerate those themes born of the desert, known to all of us today. Many men defend the rights of the irrational: "humilated thought" has never ceased to exist. Criticism of rationalism is very common and it hardly needs to be made again, yet in our age there is a resurgence in paradoxical systems which trip up our reason. But this does not prove the efficacy of reason: it only proves the intensity of its hopes. On the plane of history, such a constancy of two attitudes illustrates the passion of man torn between unity and a clear vision of the walls enclosing him". [paragraph ends]
In the light of the context, I feel I can accurately "translate" this paragraph as saying: "the long philosophical discourse on the topic of "reason" is still relevant to this day and age, although it might seem a well-trodden ground".
[new paragraph begins] Never has the attack on reason been more violent: never since Zarathustra's outburst "it is the oldest nobility in the world that I conferred upon all things when I proclaimed that above them no eternal will be exercised"
(for me it is not obvious that the quote from Nietzsche illustrates the purported "attack on reason", and it is hardly best described as an "outburst" - it is more like a riddle with the stress on the notion of "nobility" - a typically Nietzschean riddle, in fact.)
...nor since Kierkegaard's fatal "malady that leads to death with nothing else following it"
(Presumably the context of the Kierkegaard quote is that "Reason" is the "malady" that leads to death)
...since Kierkegaard's malady... the significant and tormenting themes of absurd thought have followed one another. Or at least, and this proviso is of capital importance, the themes of irrational and religious thought. From Jaspers to Heidegger, from Kierkegaard to Chestov, from the phenomenologists to Scheler, on the logical plane and on the moral plane, a whole family of minds related by their nostalgia but opposed by their methods of their aims have persisted in blocking the royal road of reason and in recovering the direct paths of truth.
These thinkers (many of whom I admire, like Kierkegaard and Heidegger) all form a "family" of "nostalgic" thinkers who "block the royal [i.e. "benighted"?] road of reason" AND "recover direct paths of truth". Is that a compliment or a critique?
.... and there is even a third claim in the same sentence: that "the methods of their aims" (whatever they are) "oppose them".
The best I can make of all this is that the writers in question (who, like all philosophers of the age, all criticised capital-R "Rationalism") advise more direct appreciation of "reality" than, say, Isaac Newton would have conceived of "reality" (i.e. via "rational" means). The part about the "methods of their aims opposing them" seems like a recapitulation of the idea that capital-R "Reason" is a chimera and that in using reason, philosophers are somehow using sub-standard means.
I come back to the definition I started the thread with: style over substance. The substance of this paragraph so far is merely a statement of what every experienced reader of philosophy knows, but swimming in a lot of lugubrious wordings that are - to my mind - nothing more than presumptuous in their posturing (he often uses phrases such as "of course", "as everyone knows" or "ridiculous" to disengage from thorny philosophical issues).
I see I have already written FAR more than I have quoted, but that just illustrates the (unpleasant) experience I have had in reading him. I will try to be less pedantic now and finish up the relevant quote, in order to give him a fair amount of context, but I will mark my ongoing frustration with square brackets as I go on (edit: some of these might be issues I have with the translator, not the author):
I assume these thoughts to be known and lived ["live a thought"?]. Whatever may be or have been their ambitions, all started from that indescribable universe where contradiction, antinomy [what?], anguish or impotence reigns ["universe"?] And what they have in common is precisely the themes so far disclosed ["disclose themes"?]. For them, too, it must be said that what matters above all is the conclusions they have managed to draw from those discoveries. That matters so much that they must be examined separately. But for the moment we are concerned solely with their discoveries and their initial experiments; solely with noting their agreement. If it would be presumptuous to try to deal with their philosophies, it is possible and sufficient in any case to bring out the climate that is common to them.
Following this paragraph are summaries of the above-mentioned philosophers Heidegger ("he points out the world's ephemeral character"), Jaspers ("he knows we can achieve nothing that transcends appearances"), Chestov (who "demonstrates that universal rationalism stumbles upon the irrational in thought"), Kierkegaard (who "lived the absurd"), and Husserl (who "reinstates the world in its diversity and denies the transcendence of reason").
What follows these is the claim that "the world itself is but a vast irrational" and the chapter ends.