The fact that the NSA is spying on everyone through every channel it can? Not surprising, if grossly unconstitutional.
The fact that they had 1000 sysadmins who had the rights to every operational detail in the agency? Shocking. As far as I'm concerned Snowden helped national security by exposing such gross malpractice.
^^^
This basically. Prior to Snowden, I for one at least was laboring under the delusion that the federal government was following its own rules and using its FISA privileges only when they had some reasonable suspicion the suspects were terrorists. Snowden has proven me wrong in dramatic fashion and I respect him for it.