That's rather harsh. Exposing illegal, objectively treasonous activities by the government is not exactly not something positive, regardless of whether the regime has only gotten worse and more totalitarian and tightened its noose even more around the neck of humanity.

By objective measures, having the courage he did to do what he did was courageous, albeit possibly foolish, since his understanding of the USA did not actually match the reality of what the USA long has been, because he has been drinking the Kool-Aid too.

Ironically, the system depended on and somewhat still depends on the very kind of belief in the system that Snowden had, even if he just believed it far more and actually took it serious.