If he had faced the consequences of his actions, he wouldn't be around right now to continue this discussion.
I'd say Snowden made the right choice.
Nonetheless, I'll expand on what I meant by "popular"; in the mainstream his flight is seen as evidence of guilt, and the particular countries to which he fled cast even more of a shadow on his intentions. Lots of people I've talked to think he must be an enemy because he fled. Martyrdom is always terrible for the martyr but often better for the martyr's ideology than the alternative. You're definitely right that he's having a continued impact on the discussion, and perhaps that does make his exile a net positive for his ideology. But the people I know who think he's a traitor who betrayed his country before seeking asylum with its enemies don't tend to listen to what he has to say.
(I understand your point, though.)
Trials aren't for finding out facts or uncovering the truth. They are the formal processes that a government must do after deciding that a citizen deserves punishment to actually effect their decision.
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Which is why I think he should not return to face trial, because I think there's no way he'll ever get a fair and open trial in the US.
Regarding Snowden fleeing, if you disagree with his choice then give this interview a read[1], it is with the whistleblower for the Pentagon papers. The opinion is that if Snowden didn't flee in today's climate then he likely would have ended up in isolation or Guantanamo.
As an outsider to the US it is interesting to observe that American's (on average) have a high distrust of their government, yet follow quite closely the US government's line. (Please note this is not intended to inflame, but it is an honest observation from an outsider that has observed many American's and is intended for you to reflect upon).
[1] http://www.salon.com/2013/06/14/daniel_ellsberg_edward_snowd...
That's his opinion, and it's unfounded IMHO. Actual terrorists are increasingly and deliberately put on public trial in New York, and Bradley (now Chelsea) Manning got his (now her) trial as well.
If you believe public opinion polling, a majority of Americans don't like what he did and think he should return to face trial: http://www.cbsnews.com/news/poll-most-think-edward-snowden-s...