Well. I watched the 1st episode last night.
My frame of reference is a reverence for my childhood/adolescent elder neighbors and family who fought in WW2, most all in the European Theater.
As a consequence, I've been a bit of a student of that war since then.
To me, the photography and air sequences were excellent, often as stunning as anything I've seen on a screen, though cut short to fit.
(In reality, the pervasive and capricious terror of those runs lasted for hours.)
The production apparently went to great lengths in the areas of accuracy.
Some of the presentation is a bit "Hollywood", and in places the score is a bit overwrought and unnecessary.
I wouldn't yet place it equal to Band Of Brothers, which to me is perhaps the best of the WW2 portrayals, if not among the best.