Was there ever a time when WW2 had been taken seriously in PC games though? I can't think of anything which would qualify for taking the subject serious.

And I mean serious as in being able to provide a similarly profound and poignant experience as if you would watch something like Stalingrad, The Pianist, Das Boot, Schindler's List, Come and See or Der Hauptmann.

The Wolfenstein series is and always has been pure, over-the-top pulp, the Call of Duties/Medal of Honors/Battlefields/Brothers in Arms/etc are notoriously one-sided, positively dripping with dull patriotism, not to mention fond of a bit of revisionism here and there and the turn-based/grand strategy games set in the era are obviously more focused on the big picture and usually don't have a narrative of some sorts to go along with it.

Through the Darkest of Times is certainly not perfect and is let down by a few questionable design choices but you could argue that it is something which attempts and for the most part succeeds in a serious take on the subject.
Warsaw, at least by the looks of it, probably too.

I don't mind punishing, bordering-on-unfair difficulty at all and do hope it's as or at least close to as unforgiving as Darkest Dungeon is. There's already enough Darkest Dungeon-likes which play it safe and dial back on the challenge to cater to a larger audience.