There is an obvious (maybe interesting?) novelistic irony to Nausea. By being a character in a novel Antoine is in the (possibly only if we count fictional narratives more broadly?) situation where his existences has an aim and meaning attached to it; the same applies to the objects whose existence causes his existential criss: they exist to be objects for Antoine the novel character to react to. The ending of the book could offer a type of integration of this ironic characteristic, although I'd have to think on it a bit. I should read more Sartre before saying more concrete things about the novel, although none of the ideas presented in the book seem particularly complicated or in dire need of other material (not to say Sartre's other work wouldn't be interesting!). Update: I've thought on it more and I don't think it really addresses the above at all. So while maybe not a bad novel, an unnecessary one in many ways.