It's not considered good sport to steal the idea from this year's Turtledove winner y'know.
Honestly, in my opinion, One People, One Leader - a Third Reich is an odd duck. I certainly recognize its merits as an exceptionally well written AH timeline, lots of interesting original characters, self-contained story arcs, and all the countries feel more or less in character. But... I don't really believe it's a good alternate history, per se, if we look at it from a realism perspective. Picking the obscure Adolf Hitler and his DAP instead of the more well known right-wingers in Germany like Hindenburg or von Schleicher to lead this "Third Reich" in a Second Great War is eyebrow-raising as it is, but then the entire story goes its way to make them as overpowered as possible! Stealing the idea for armored warfare straight from Tukhachevsky's book, remilitarizing in a few years, somehow starting a war with the West as early as 1936, defeating France, immediately getting into a fight with the Soviets and winning!
Turning a country which collapsed by this time in OTL is, as someone who got his tongue extended across the continent would say, a pretty big stretch.
At least the author had the decency of not actually glamourizing the DAP and Hitler, instead taking the option of writing the story from the perspective of the villains. Because honestly, they are as close to villains as you can get in this site's AH timelines.
Though I don't personally view it in high regard, I do believe that some of its ideas are sound. A New Triple Coalition composed of Germany, Italy, Japan and a bunch of Central European states isn't far off, although, honestly, I'm not sure why Japan is included at all, given that they don't even participate in the story all that much (the "unavoidable" war with America never happens, and the Japanese don't even attack the Soviet Union for some reason, despite having all of China under their control). The idea of the Soviets and the "Third Reich" working together for the first few years is interesting too, and I honestly believe something like that could have happened.
I think you should go read that timeline if you are interested in this scenario, but remember that it could definitely be made more realistic.