Brad Pitt, Joel Bissonnette, Paul Dillon, and Holt McCallany in Fight Club (1999)
Extremely important: If a film is truly amazing, like Fight Club (1999) or American History X (1998), the difficult subject matter or topics at hand should not be enough to dissuade me from enjoying future viewings, regardless of how controversial it may be, plain and simple. Re-watchability should always be the chief factor when judging classics.