The title of this miniseries comes from the first line of Wilfred Owen's 1917 poem, 'Anthem for Doomed Youth': "What passing-bells for these who die as cattle?" It attempts to show the innocence and misguided bravery of the extremely youthful soldiers who enlisted in World War I from the outset, having no idea what they were in for or even why.
The two leads play a German youth and a British youth who sign up that way, and the film follows their separate experiences of the interminable and increasingly meaningless war. (They do cross paths now and then, which adds further meaning to the film.) The acting of both leads is fine.
The main issue with the miniseries is that it was deliberately aimed at a younger audience and family viewing, so it is slightly sanitized, and slightly one-dimensional, and adults may find it somewhat unfulfilling. There is a certain eloquence about it, however, especially as it concludes. And it can certainly be very educational for younger viewers.
One issue that seems inevitable is that it is initially hard to tell apart the British and German regiments, since British actors were used for both and their uniforms are not terribly distinctive. Although it's clear in the beginning which is which because German soldiers were still wearing ornate pointed helmets, the Germans had soon dispensed with them and so the viewer has to pay very close attention from the very beginning. Theoretically the BBC could have found young Germans to play all of those roles (speaking English with German accents), but I'm fairly certain that would have been way out of their budget for this relatively minor project which was one of dozens of WWI productions commissioned for the centenary of the war.
I'm not sure who I would recommend this for, but it does have a certain slow-moving eloquence, and is suitable for young viewers, young history or war fans, and family viewing.