It is certainly not a box office film, but I checked the DVD of Chinatown out at the library over the weekend. My wife and I saw it in the theater in when it was released in 1974 but not since.
Great film that holds up exceptionally well. For younger movie fans, it's worth seeing.
As a 24 year old, I agree with that statement! Though I'm not the typical younger moviegoer. Jack Nicholson was fantastic in that film.