It's a really solid show, especially given the source. I'm not familiar with the physics of the bomb, the process they took, or the major players in the manhattan project, so I don't know where they've decided to take artistic license, but I enjoy the development of the competing theories.
I do feel like they're focusing too much on how we see the war in hindsight rather than how they saw the war at the time. The depth of the Nazi crimes against jews on the basis that they were jews rather than some flavor of red political actor wasn't accurately known or appreciated by the west. The anti-semitic flavor they mention seems to be more than the broad strokes, and the hysteria of the jewish mother was a bit strong. Hell, before the US got into the war there were isolationist minded elected officials summoning jews to testify regarding jewish warmongering.
Also eugenics was a darling theory for whites here and in other allied states into the beginning of the war. It seems like a missed opportunity that they haven't demonstrated much of the support for Nazi Germany from the irish and german americans or the eugenists in america. The three global conferences for eugenics were not in Germany, but in the UK and US. Then they throw in the gay, black, and injun angles and I'm just like....eh....try less hard please.