The technical facets to this are excellent. The whole look and design is really full of dust and rubble and a vanquished nation. The actors too show their skill and across the various nationalities all hit their marks.
Where the series falters, and often, is the story and plot. The plot is the mechanism and the story is the overall narrative. It has everything thrown into it from fraternal love, psychological cracks, art theft, Cold War espionage,a bizarre female resistance etc . It is so cluttered as to be a mish-mash of of high drama and incredible, story telling.
It may succeed with some audiences but it seems a little desperate, as if they are not quite sure of what they have and have conceived all manner of subplots to keep this thing spinning so you don't notice that it's, well, a bit nonsensical.
In a way its like the dime novels that had a thrill every few pages to keep the reader hooked but when they finished the book they couldn't remember anything.