20+ years later it's hard to have a context on Generation X and how perfectly it captured that moment in time. (American Psycho was published the same year - how's that for context!). Post-Regan, Post-yuppie (well, almost), Pre-grunge, mostly pre-internet...
Generation X, McJob etc are all parts of the lexicon now. Fight Club always felt to me like a kind of follow-up to Generation X.
It's the weakness in Couplands whole "capture the zeitgeist" storytelling. 150 years on, Great Expectations is still relateable. Generation X, not so much. I still love the book though :-)