United States of Secrets". It ends with the many and detailed secrets about how the US government violated privacy measures in law and in the constitution. Whatever security problems that may have come from the secrets he revealed is outweighed by the light he is shining on our own government. It is currently available to watch on Netflix.
Is Edward Snowden more noble in that he revealed practices the government unduly kept secret? Or was he more treasonous in that he revealed sensitive information that unduly put our protectors at risk? I do not have enough information to conclude definitively. I do believe that, in the long term, he has caused us more benefit than harm.
One of the principles that makes the USA great is that "governments derive their just powers from the consent of the governed". If the government unduly keep practices and policies from the people, they cannot consent to them. It seems that Dick Cheney prompted and approved breaches in the boundaries set after Watergate. The NSA has been gathering data from the Internet and elsewhere on a wholesale level, starting sometime after 9/11/2001. Edward Snowden revealed this secret and has done us a service in doing so.