Originally Posted by asaris

Sorry, roachboy. I should have picked up on that, but I was in a hurry. Anything I say about Sartre is based on Being and Nothingness since that's the only work of Sartre's I've read (though I've seen No Exit). Whether or not that's what the original poster has in mind, I don't know. The Nietzsche argument seems like a non-starter to me. Nietzsche, or, to be precise, early and middle Nietzsche, had a more nuanced view of Christianity than his later writings would lead you to believe. The best example I can think of, which occurs rather early in The Gay Science, talks about the ascetic and paints him in a pretty positive light.

As far as what 'reactive' means, I would guess he's referring to the idea that "slave morality" is formulated in reaction to "master morality". As far as objections to Nietzsche's characterization of this in the Geneaology, there are two ways I'd go. Either using some variation of Hegel's master/slave dialectic or the simpler line of reasoning that, if the slave morality won out, that must mean that the slave morality is really the strongest and therefore best exemplifies the will to power. They more or less amount to the same objection, though the Hegelian is going to be the more sophisticated.