Good posts Wolfy.
1. I agree, the Gw 43 was just a smallarms weapon.
2. Mp44 was good and probably something like a precursor to the AK47, but again, not a war-winning difference from the M1 and tommygun put together.
3. Tigger 2. If Germany couldn't produce many of them before they took over half of Europe (and that half's industrial power), then they sure couldn't produce them at the beginning of the war. Besides, it was much like the tanks of WW1. Slow, heavy, and though heavily armored, could be taken out by tanks and artillery.
4. 262. Would have done squat diddly if they didn't manage to increase the range. 1000 km makes this fighter a relatively DEfensive, not an OFFensive weapon. Keep in mind, the Mustang could go an impressive 2,700km and i'm not including the combat totals in either of these.
5. Comet. Couldn't have said it better myself, wolfy. That's why I'm not going to say anything about it.
So in general, military secret weapons were not the key to victory in the epic slogging match of WW2, it was industrial power at home. And in that, the Americans easily outstripped both the Japanese, Germans, maybe even the Russians (though i doubt that.).

__________________
To the German Commander-- Nuts.

-- The American Commander