Oliver Stone is a trash Putler apologist. Snowden will only appeal to conspiracy theorists, people who don't know the basics of computer privacy/security or people knowingly doing something evil on the internet. Instead of falling for the propaganda displayed in this film, learn about internet security/protecting your privacy from a trustworthy source. Don't listen to a Hollywood hack whose last great work was Conan the Barbarian.
Go watch Conan the Barbarian instead. Stone wrote that movie and it at least won't contribute to the dumbing down of Western civilization. It's entertaining as all hell too. So yeah I give Conan the Barbarian a good review.