Deanna, I also haven't seen the movie Cloud Atlas. The critics were certainly divided on it - an overall 66% from Rotten Tomatoes.
"Some say itâ€™s an awe-inspiring work of visual and emotional daring, while others say itâ€™s muddled, pretentious, and overlong. Itâ€™s a series of interconnected vignettes that follows a variety of characters . . . across centuries, as seemingly small actions and events have monumental repercussions. The pundits agree that Cloud Atlas is a singular film, but while some are thrilled by its monumental scope and big ideas, others say itâ€™s too undisciplined and disjointed to realize its outsized aims."
I can certainly believe that the complexity of the book doesn't lend itself to cinematic representation.