On Nazi Germany.
Classifying Nazi Germany as an outright failure seems somewhat dismissive. It was a broad and (overly)ambitous experiment in sociology, it intended and achieved at uniting the Germans in one common goal, this is not deniable. To achieve something as large as what Hitler planned one could not simply use the old disgustingly virtous reasoning layed out by Plato and the rest of the sophists, purging a people of its old habits (whether it be intellectual, religious or in a way itself) was not an easy or 'moral' cause, my case in point is that you are applying a highly moralized perspective on matters and refusing to acknowledge the need for the 'cohesive chaos' the 3rd Reich used in staying in and spreading its power.
You touched on the State within a State 'problems' that plagued the 3rd Reich, I of course for discussion purposes disagree.
A highly centralized state is contrary to belief quite easy to behead. Taking out the main legislative branch of the Reich would not cause everything to fall apart, as what happened in the USSR (The USSR was of course under a different set of problems), actual revolt in the 3rd Reich was not entirely impossible but then again it was not entirely possible either- we saw the hammer come down when the Stauffenberg bomb plot failed, a show of power also took place when the 'Night of the long knives' took place, the key word here is of course power.
After looking over this post it seems to be quite horrible and well... shoddy, none the less I will post it and admit that my only historical lesson in the 3rd Reich has been 'The Rise and Fall of the 3rd Reich' and my grandfather a Luftwaffe/Fallischirmjager(sp?) volunteer. He may have been an ardent Nazi but I am not and need some time to build a fair and logical conclusion to my assertations. I will of course do this tonight and post some more tomorrow morning. And for this I apologize.