The Big Short was actually a fantastically well done movie (finance nerd).
The Big Short is an amazing book, and a great, funny, emotionally powerful movie. It also helps to spread a great essential message - that wall street is out of control and we need to get it to back to some saner, less criminal, more socially valuable place.
However, I have a big problem with both the book and the movie in that they lionize the people who shorted the failing market - thereby pouring gasoline on a fire and making a crisis explode into a depression.
While what they did was both legal and logical, it doesn't feel right to celebrate people for destroying a damaged American economy buying insurance on something they didn't actually own (i.e., straight up gambling).
The book and movie fail to mention that the heroes, while upright and non-fraudulent, made America much worse because our system allows financial instruments with such potential leverage and moral hazard.