Post-structuralism has its place, and I'm a big fan of it now, but I also hated having it pushed on me in high-school literature lessons -- that seems to be a very common experience, and one that really can damage people's enjoyment of fiction thereafter.
I'm not sure whether the problem's one of presentation ("find the meaning! it can be anything you like!"; "er, say wot, miss?"), or whether the average teenager just doesn't have the right intellectual frame to really appreciate the idea "meaning is a product of the interaction between text and reader, not a product of the text alone".
Back in high-school, I overcame my frustration at the perceived arbitrariness by approaching the task ironically -- "sod it, I'm gonna pick the most outlandish reading I can think of". The teachers seemed to think the results were great, which I found pretty amusing.
 I refer to http://en.wikipedia.org/wiki/Post-structuralism#Destabilized... in particular.