So, I watched the first two episodes. The quality of the footage is OK although it's not real HD. I mean, the resolution might be there but just don't expect crisp and clear pictures.
I'm am however very much on the fence concerning this production. Like I said, footage is good, which is a main selling point. But I don't like the over dubbed sound or the narrative nature of it. Furthermore it jumps back and forth through time and events, there is no real chronology. And a lot of times I get the feeling they are using footage just to fit the narrative. The edditing is too fast - you barely have more then a couple of seconds before there is another cut.

Since it also only focusses on the American involvement in the war the title of the show itself becomes misleading. It should say "WWII (from America's pov) in (mostly grainy) HD"

Ultimately I'd rather have a real movie or a hard documentary instead of this in between style.