I read this story in the 1980s when it first came out in American comics, and loved it back then. Now I'm re-reading the collection. This edition also includes the "Block Mania" stories that lead up to and into the Apocalypse War (bonus!). As a kid living in the era of mutually assured destruction, it was certainly interesting to read a comic that visualized how such wholesale slaughter would play out (in comic form).
Dredd is his usual self, and other judges get killed off like flies, as does most of Mega City One and East Meg One. The art is outstanding, but not to everyone's liking, especially in the Apocalypse stories drawn by Carlos Ezquerra. His art is deliberately squiggly and vague, not the standard comics "look" of the 80s (the Block Mania stories are) which is why I liked it so much at the time. It's simply "different." The current look of Judge Dredd: Mega City Zero is similar to Ezquerra's work back then, perhaps by design.
The stories are about what you expect, once you get over the idea that city leaders are deliberately killing hundreds of millions of people, saying things like "Why would we care about the people?" and "What makes you think the people would be interested?" (Dredd gets a pass, because his people are too caught up in Block Mania to care about the war.) It'd be silly if it wasn't something on all our minds back then (and maybe again today, sadly). People willing to kill millions for their preferred ideology (or deciding to sacrifice millions rather than have them live under an opposing ideology without asking if they are ok with that) is always disturbing, even in comics, though that was something you had to think about back then. If you like comics or Judge Dredd or post-apocalyptic (or even recurrence) literature, this is for you.
It's also worth noting that for about the cost of a softcover collection, you get a sturdy hardcover with quality paper and brilliant color. The book looks very nice. I wish there'd been some kind of intro or contextual material about the stories and where they came from, maybe notes from the author or artist. The section dividers are also lame silhouettes of Dredd, and they have not included the individual covers, which I always like to see (in fairness, I think the story was originally published in 2000 A.D. (the comic) along with other stories and characters, so the covers weren't always Judge Dredd. A little extra material would have been nice, but it's still well worth $20.