Oldboy takes a hammer and "batters" its American equivalents, leaving them as pulped as a chewed up squid. Park Chan Wook displays what America misses with his ultra-stylish, ultra-violent thriller. Why watch Ben Affleck fail spectacularly to summon any displayable talent, when Min sik Choi serves up a memorable role as the disturbed, vengeful Dae Su Oh, in the second of the Vengeance trilogy. Park skillfully creates a compelling plot that will have you guessing through the entire film, up until the final shocking revelation. The Cinematography expertly done by Jeong-hun Jeong, who also worked on the follow up to this film, Chinjeolhan geumjassi. Everything about this film is done in style and panache and creates a memorable experience, and has many memorable scenes.
Many people accuse this film of being "unrealistic". These people forget that this a film, not a documentary. No one complains About Star Wars being unrealistic, and rightly so. Films have a right to stretch out reality, don't forget the reason it does this is to be entertaining.
Although the film has strong violence of a graphic nature, I advise you to watch it, if only to broaden your perspectives of world and Asian cinema.