There were doctoral faults deeply embeded in the Nazi system that set the stage for defeat, they doomed themselves.
Their policies on the Jews ensured that they lost the foremost nuclear physicist, ensuring they'd never developed the greatest force multipier of all, the atom bomb
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Their policies on the treatment of people other than what they considered of Germanic blood, lost them many potential allies. A classic example of making enemies faster than you can kill them. That resulted in tieing down many assets that would have been useful on the fronts.
Their whole industrial base was hampered by a system of favortism and cronyism, that led to much dupilcation of effort and wasted effort on projects that had no chance of effecting the war being fought. Such a mess even Speer could only correct some of it's problems.
And then of course their's Adolf himself in charge.
This is the usual Hollywood distortion of history. It avoids subtelty and objectivity. These people could keep whineing longer than a J-79 connected to an oil refinery.
Nazi Germany maintained allies in the form of Hungary, Rommania, Bulgaria, Italy with friendly relations with Turkey, Spain, Portugual, Argentina. Within the nascient Arab states and independance movements they also had friendly relations. Nazi Germany had co-opperation agreements and for instance brought Bulgarian students to Germany for education. A victorious Reich certainly would have had allies and friendly nations.
Within a few months of opperation Barbarossa Hitler is signing orders to release Ukranian POWs. Hitler is even quoted in table talk advocating the introduction of Ukrainian blood/women into the race to improve the strain (table talk page 696). Faced with the reality of contact with other races and cultures the Nazis threw the book away and started again. There were even black (half black half white) officers in the Whermacht, results of marriages between Germans who had lived in Africa.
Nazi racial ideology is a lot more flexible, reasonable than the hyped version of history would have us believe. That's why it enroled a substantial portion of the world.
As far as the atomic bomb goes: the Germans lacked the resources to complete a bomb by 1945, It has nothing to do with "Exiled Jeiwsh Scientists" in fact the USA lacked the resources to comple a bomb by the end of the european war. Having a synchotron was more imporatant than any supposedly superior exiled Jewish scientist. A German A bomb would have been ready by early 1947 given their virtual success in achieving criticality in late 1944., probably mid 1946 had there been no bombing campaign. They kept their research at an R+D level rather than precieding to industrilisation in order to find more efficient ways of achieving enrichment etc and decided to go for a reactor as a stepping stone. It's possible they would have bypassed gaseous diffusion and caulutrons entirely.
The B8 Hairgerloch critical reactor, which proved reactor dimensioning, could certainly have been expected to have been conducted a year earliier given the Heavy water and Uraniun they need and its slightly enlarged succesor variant (50% volumetrical) go critical had the researchers not have been forced to move from their city institutes or have loss so much equipment from bombing.
You might also cite what the projects were "that led to much dupilcation of effort and wasted effort on projects that had no chance of effecting the war being fought." and how that was worse than the allies.