I think the way Snowden went about things was extremely professional and honorable. While we can certainly debate Manning's approach, what issue is there with snowdens leaks? He didn't just dump a ton of stuff on WikiLeaks but instead did his best to involve a well respected journalist and have them work with the authorities to ensure no one was harmed in the process. Of course the government weren't exactly cooperative at every step and the journalists certainly had their part to play as well. That said, I find it hard to fault Snowden for anything. He saw a lot of concerning things going on, did his best to provide those details to an unbiased party accustom to dealing with such matters, and he generally did his best to stay out of things.