Of the big horror movies of the '70s, you have 'The Omen,' 'The Sentinel,' 'Rosemary's Baby,' 'The Stepford Wives,' 'Burnt Offerings' - these are all romantic fatalist movies where there's a sort of glimmer of hope... but darkness wins.

This quote is talking about the horror movies made in the 1970s. It mentions five specific horror films that share some similarities. These five films are all about fate and romance, but in the end the darkness usually triumphs over hope. This means that in these movies, even though there is sometimes a hopeful moment, unhappiness or evil usually end up winning out.