Having read the book, I knew what I was getting into when seeing this movie. A story heavily based on scientific facts, but still understandable through the way everything is explained. Andy Weir, the author of the book, and Drew Goddard, who wrote the screenplay, did a great job at clarifying how everything works and why everything does what it does.
Besides the science, this movie also relies heavily on the wit and humor of the lead character. Since he is left on his own on another planet, the writers really had to step up their game to make a character, who is constantly talking to himself, remain interesting to watch. They have a great balance between cutting back and forth between Mars and Earth, where other characters are able to break the monologue. When watching the trailer, this looks like a pretty serious movie with a lot of action and drama. Except it could surprise you with the amount of humour in this movie. Though I did think they did a better job in the book with that (Just look at the first sentence in the book, come on).