The first is obviously the revelations about NSA "overreach".
The second is that this guy could've remained hidden but he put his name behind the revelations rather than choosing the far safer path of being an "anonymous source". This lends his revelations more credence and you have to respect the guy for standing by his convictions. Maybe he would've been found out had he stayed in the shadows but he certainly didn't try to do that.
The third is that the US is very much two-faced here. It seems clear that the surveillance is being justified by a technical ruling to do with US vs foreign persons, a classified ruling no less. While this might be a fine legal argument, it doesn't engender support amongst foreign powers when you tell them you have every right to spy on their citizens but oh, by the way, can you do us a solid and hand over that fugitive?
In what world does the US think they'll get cooperation from anyone when they aren't treated not even as equals but with simple decency? So the foreign policy apparatus resorts to bullying tactics.
The fourth is that both China and Russia were blatantly thumbing their noses at the US. I see no world in which Russia hands the guy over so the actions of the US have done little more than force a guy in possession of Top Secret information to be harboured by a rival. Congratulations on that statecraft, Obama, Biden and Kerry.
What's more it's made the US appear internationally weak.
The last is that the various players on Snowden's side do seem to have screwed the pooch on this one by both issuing a letter of safe passage and not having some kind of contingency when the US did the predictable thing and revoked his passport. This could hardly have been an unprecedented move.
So good luck to you, Edward Snowden. I hope your sacrifice hasn't been in vein. The optimist in me hopes that a future president will pardon you and otherwise reverse this self-destructive course the US is on.