Even if the notorious 1970s porn-filmmaking milieu doesn't exactly turn you on, don't let it turn you off to this movie's extraordinary virtues, either. Boogie Nights is one of the key movies of the 1990s, and among the most ambitious and exuberantly alive American movies in years. It's also the breakthrough for an amazing new director, whose dazzling kaleidoscopic style here recalls the Robert Altman of Nashville and the Martin Scorsese of GoodFellas. Although loosely based on the sleazy life and times of real-life porn legend John Holmes, at heart it's a classic Hollywood rise-and-fall fable: a naive, good-looking young busboy is discovered in a San Fernando Valley disco by a famous motion picture producer, becomes a hotshot movie star, lives the high life, and then loses everything when he gets too big for his britches, succumbs to insobriety, and is left behind by new times and new technology.