Yup, ther are a lot of factors in the Nazis losing, not least of which was in fact the Nazi party itself. Like most dictatorships, there's a lot of political mistrust and favourites played. Much of which spilled over into deciding which industrial projects got the go ahead and which played second fiddle.
I think most people know that the Kriegsmarine was not exactly a hotbed of Nazi fervour, which probably played a large part in it not getting more modern equipment sooner and in greater quantities.
And I guess we can all be thankful for that.
Back on the original topic however, or at least a tangent of it. I think comparing SH1 with SH4 could turn out to be quite depressing, in that it might point up how little things have moved on, barring the eye candy