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Carlin is entertaining to listen to at times, but the information density is quite low. He takes a long time to say not much, all the while sounding quite profound. I'd recommend the classic references instead/as well: * The First World War by John Keegan * The Guns of August by Barbara W. Tuchman
See - at times the pacing is what I quite like - I agree that there are other ways to get information across faster, but Carlin plays with the audio format to force you to dwell on certain things. It has some passages on the human cost / experience of war which are incredibly memorable imo. Of course no one source should be used in isolation and YMMV.
Nothing's ever made me feel the way the 2nd-3rd episodes of that show made me feel. There's something about the horrors of trench warfare being described in his way that really brings it home.