Trigger warning: Just about everything...
You know what it would be like to watch a "Freddy the Frog" rewrite by Khaled Hosseini? The movie "Sin" is basically that. It's about a hotel receptionist who meets an alcoholic and they start having a relationship. Along the way, there's tons of drinking (which would be an excellent explanation for the screenwriting), homophobia, arguing, affairs, yelling at God, hospital visits, more homophobia, more arguments, domestic disputes, attempted suicide, more hospital visits, and even incest. You can kind of see the pattern.
The only reason the story gets a 6/10 score is because it's at least interesting. The rewatch value is 5.5/10 because the movie is so bad, it's funny. Maybe it would be a fun movie to prank people with by showing it at a party.