I make a point of knowing as little as possible about the films I see at the Sundance Film Festival (or any other film festival -- or just films in general, for that matter) before I see them because I want to see them with a blank slate.
Only serious jazz fans remember Joe Albany, a pianist whose bright and energetic attack kept him working until his death in 1988. Low Down, based on a memoir by his daughter, Amy, feels hackneyed, despite being a true story.
The Purge is a high-concept blunt instrument of a thriller, a movie that offers a straightforward set-up and few subsequent surprises. It does exactly what you expect and doesn't really go anywhere you don't assume it will.