You are Australian right?
I don't think he's a hero. Not in the slightest. Didn't think Chris Dorner was either. Exposing the system for what it is is one thing. But depending on what he knows he could cripple the US. Besides, I thought everyone already assumed Uncle Sam was watching? Yet everyone seems to be flipping out. I honestly don't give two shits if the government knows what type of porn people watch but there are people who do. Mostly bible thumping hypocrites. But the US watching everyone has more than likely stopped more terrorist plots than we can count.
I think the US Government is making themselves look like fucking idiots. However, if Snowden actually has information that could potentially start another war (access codes, gov't secrets, etc) then he is a horrible person and has no idea what he is doing.