If you like Quiz Show, try Broadcast News or Magnolia
Broadcast News (1987) has schlubby guy Aaron Altman (Albert Brooks) vs. handsome devil Tom Grunick (William Hurt) - in fact, at one point Altman makes a case for Grunick being the devil.
Like Quiz Show, it gives us a look at how show business works behind the scenes.
And Altman reveals that Grunick was cheating at his job.
There's also Magnolia (1999), which has a plotline involving a quiz show that goes off the rails.
I'm surprised that neither movie is on the list of recommendations:
http://www.imdb.com/title/tt0110932/recommendations
I guess even a complex formula can miss a few.