I listened to "Man in the High Castle" a while back. When I got to the end of the book it felt like Audible has messed up and not included the entire contents. Over the next few days I listened to it again to try to understand what special meaning was missing. And nope, it didn't really have any special meaning for me.
Revisionist histories are interesting, but shouldn't get praise because of their nature. In this case it was very interesting to read about the new US. Still, it didn't have any particular meaning that goes much more in depth. Most of the Nazis were as shallow in development as you could find in a Sunday morning History Channel show. The Japanese did seem a little better, but it seemed more like a description of an action scene instead of a complicated reality.
My guess is that it won't get many new fans based on the mini-series unless they substantially adjust the content. Approachable by Dick's standards, but with so many other good books out there it is hard to understand why Amazon would give this book a mini-series. Personally it wouldn't be high on my list of translations to the screen.