One thing to remember in comparisons to movies and music is that even if you don't "get it", you can still watch a movie and listen to music. Lack of understanding does not prevent you from consuming the experience. If you don't understand the rules of a game, then you cannot play the game at all. If it can't be played, is it even a game?
With most books and movies, one doesn’t spend much time and energy asking oneself how to read, how to watch—one just reads or watches. With games, most of the time is spent thinking of tactics, of strategy, of opponents’ psychology, which leaves little time and brain power for dealing in depth with a serious topic