I try to avoid snooty English-major critiques of the social sciences: Condemnations of the impenetrable nature of "sociologese," for instance. After all, social scientists are doing different things and pursuing different ends than folks in English, so some differences in writing styles make sense.
This book, however, broke me--at least temporarily. Wagner raises some potentially interesting points about the ways invention and convention contribute to how cultures are composed. He is so committed to binary dialectical oppositions, however, that the book often seems reductive. He is also remarkably inconsistent in what words he uses for particular phenomena, which makes reading the text an incredibly difficult process. Not that difficulty can't serve a purpose, but I don't get the sense there's a point about the inherent flaws and limitations of language underlying the density of his prose.
In short, though Wagner's ideas as occasionally compelling, there are probably other, clearer books on the ways cultures' epistemologies work.