Well I saw the Che Guevarra movie you're talking about (part 1 of 2 that is) and it was a snooze fest. I don't understand people's infatuation with the guy... not to spoil anything about it, but it's basically him and his cronies shooting anything and everything for 2+ hours. I like action movies a lot but this thing literally put me to sleep a few times.
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As to Valkyrie, saw that one too and thought it was decent enough. I agree they should have showed Hitler surviving it at some point but I guess more drama is built up letting the audience guess whether he made it or not (though most people with 1/2 a clue as you pointed out would know that he DID make it).
Aside from everything that went awry immediately after, at the very least I think they should have pointed out why he wasn't physically killed by the blast. Stressing the importance of the bomb and its placement came into play as well as how 1 was used instead of 2, how the bomb was originally designed for the his concrete bunker which would have helped contain the blast. How the other officer moving the bomb from one side of the table's legs to the other and so on helped him survive.
But whatever, I guess it's just more Hollywood schlock, you can't expect them to get everything right. After reading Mein Kampf I've come to the conclusion that Hitler really believed what he was doing was the right thing to do. And while I couldn't disagree with his point of view on race and religion more, as I think it was Will Smith of all people said recently, something like when Hitler woke up in the morning, I don't think his first thoughts were "how can I be the most evil bastard possible?" or things along those lines. He just thought he was doing the right thing for the country.
Anyway, that's just my .02 +/- adjusted for inflation.
orb.