If your history of WWI was primarily from this TV show you'd probably believe that all the soldiers were 16-17 years old, widely engaged in premarital sex, and that the wars were fought almost exclusively in trenches, including right up to the very end. These are all things that yes, they did happen, but were rare, or happened at points and places in the war very different from that portrayed on-screen. At first I was concerned that the 30 minute format wouldn't allow them to tell the complex nuanced stories that were the reality of the war. By the end I was glad the stories were only 30 minutes long because they were having difficulty filling the time with anything not a blatant trope.
Even if you ignore the history there's some serious structural problems. The German soldier's girlfriend/wife is a major character in the first few episodes before entirely disappearing. All of his home front scenes are about his parents and the wife appears only occasionally as a picture. Seems a little off.
Also, you might recall that the french were a major player in WWI. Something that is sort of overlooked considering that there are almost no french characters, no french scenery, and really, that the western front is located across hundreds of miles of France is barely mentioned. Here's another specific inaccuracy: During early war when the first British reinforcements with our new recruit are deploying in the aftermath of the Marne they march through fields full of poppies. Fair enough, right? Poppies are the anglophile world's key floral symbol of The Great War. Except that after the Marne was September-October 1914 and Poppies bloom in the spring and early summer. They just didn't care.
There is nothing in this show that has not been done better, elsewhere. What there is, is weak or remarkable for its inaccuracies.