I first read this in one night when I slumped drunk on my friend's girlfriend's couch after a night out at the bars. It was truly a timely read, almost as if it was telepathic. One character actually remarks, regarding the town his troops are occupying, how he is puzzled that there were no flowers or candy thrown at the soldiers who "liberated" them, as everyone had promised they would. I mean, come on, doesn't that blow your mind just a little bit?
This work was written as Allied propaganda during WW2 explicitly at the request of the government, with Steinbeck's full compliance. It was contraband in Italy, where one could be put to death for transmitting it. It was printed on tissue paper to be smuggled through fascist occupation, and the courageous souls who took it upon themselves to get it out to the Allied soldiers narrowly missed death more than once. This, for me, is what literature is all about - writing (and reading!) as if your life depended on it. And it's immensely gratifying to know that for some, it actually did.
It's not necessarily a literary masterpiece, but it is of sufficient quality to be valuable as a piece of art rather than just a simple historical artifact. It's even sympathetic to the Nazi characters! They are portrayed as human beings, not monsters, since that would ironically play into the fascist game. After all, didn't the Nazis attempt to claim that they were superhuman? An overtly propagandistic novel that actually addresses the humanity of the enemy (and we're talking about quite an enemy here) is a mightily impressive and respectable feat, in my opinion. I'm just glad I read it. What it represents, on several levels, is so gratifying and positive that this very minor book should never be forgotten.