Guys, guys, guys: calm down. French postmodern theory is very good, useful stuff if you want to understand contemporary art and culture. Throwing a temper tantrum at it because you can't understand it is a failure to come to terms with it. ALL philosophy is useful.
Well, I didn't like it, either, until I finally sat down with these guys and "understood" them. Now I like them a lot. Whole different experience that understanding brings.