Note many fought for the Axis anyway.
I have been doing grand strategic WWII games for 4 decades now (and am currently making a fine scale 12 mile hex European map for one game). The temptation is to think that, for want of a nail, the Axis could have done this, that, and the other thing, and won the whole shebang. For a wargame you can’t make it TOO one-sided, or people won’t play it (note, a gaming buddy and I discussed this topic just last night), so I’ve had to give the Axis a ghost of a chance more than they had. But the Axis were never much of a threat to control the world.
Oh, you can point to the huge swaths of territory that they controlled at their high-water marks, but that doesn’t show just how fragile said perimeters were, long before they finally cracked and collapsed. A lot of ink, and blood, has been spilled on the Atlantic convoy & Russian theatres, but UK was never in any huge danger of subs knocking them out of the war, not once US-made ships helped ensure more builds than sinkings.
The Russians likewise were going to be ok-it was a minor miracle that the Wehrmacht made it as close to Moscow as they did given their logistical shortcomings, but they could never take it in 1941 (at best it would have become the same kind of meatgrinder that Stalingrad did a year later, not a quick parade down Red Square and that’s that). In 1942 the Russians played the Germans like a fiddle, yielding ground without the huge prisoner grabs of the previous year, accumulated their forces, and waited until the right moment to spring their little trap at Stalingrad.
It it tempting to think that the Japanese could have won at Midway or in another big fleet clash, thus forcing the Allies to the table. That ignores the 2 dozen Essex class carriers which were then being built, and that the US still lost 4 of its first 6 modern carriers within the first year of the war anyway. Not losing the 4 IJN carriers at Midway likely would have prolonged things by 6 months at best-they were going to run out of pilots before they ran out of carriers in any event. Japan tried to invade China, but lacked the manpower and logistical means to conquer such a huge country.
So, the superweapons. They all had bugs and/or were not effective from a cost-benefit standpoint, or were just too late to make a difference. The 262 couldn’t have become operational sooner than it did because of its fragile engines; the XXI submarine needed a lot of teething time to remedy all the bugs that a new weapon system invariably has. The V1/V2 programs were resource sinks that had little effect on the Allies’ pace. The Germans built far too few of their supertanks, and they had bugs too.