It's really hard to get enough of this film Speaking as a guy who like his art film, including Ingmar Bergman works and the more heady Coen Brothers films, please believe me when I say I would not expect to like a movie with such low-life urban American characters and swearing.
No, I would not have expected it, but there it is. Something about the constant use of the f-word and they way these characters say it is just funny. Add that to the fact that the plotline is well-constructed with several amazingly humorous moments in the dialogue, and I think it's reasonable to call The Big Lebowski as classic.
Of course, the well-constructed plot only matters when you're done watching it and you actually have time to think about the course of events. During the movie, it's too easy to focus on the dialogue, which, while emphasizing the speech patterns of those not as skilled in language, makes great use of a wide range of speech characteristics, from John Goodman's character's rants to The Big Lebowski's (the other Lebowski) educated dialect. And, of course, Maude Lebowski's feminist rhetoric. ("Some men find it very uncomfortable to say. Vagina.") The dialogue is actually intelligent, at least in the way it's written. It's easy to forget that when you can see the characters delivering the lines.
It's quite hard to say enough about this movie, but I'll sum it up here: I laughed. Hard. I often find things in movies that make me chuckle, but this one makes me laugh over and over again. I recommend this highly in the genre of comedy, alongside films like Rushmore, which had a similar effect on me.