I have serious reservations about how genuine Snowden is as well. It's an interesting situation, and regardless of whether you think Snowden is a traitor or a patriot, the story is very divisive.

You gotta look at the bottom line, that very little of substance (percentage wise at least) has been made public of the material Snowden leaked. From the earliest get-go Greenwald was shown to be an insider. The case does get people talking and asking questions, at least for those with any open mindedness, however one can't dismiss the definite possibility the entire case is a psyop to villainize whistleblowers, to get people to inform on each other etc.