"Altogether, McCain was held as a prisoner of war in North Vietnam for five and a half years, nearly five of them after his refusal to accept the out-of-sequence repatriation offer." [Source]
Reading the rest of that section should disabuse you of the notion he was treated well. He was put in solitary for 2 years and "vigorously" tortured multiple times.
And please, own your words. You put apostrophes around military 'service' and made a snide insinuation by mentioning his propaganda tape - if that's not knocking him I don't know what is. By all means criticise him for his politics or undoubted corruption in congress, but there's no need to go down the childish path of calling someone a coward/traitor/etc that so many on the Right feel the need to when expressing disapproval of a man.
