The praise this book gets is really based on the author's somewhat unique-for-its-time premise here - that is, that the allied war effort squandered resources and won merely through bashing the enemy repeatedly with a far bigger stick, rather than through intelligent, well planned operations.
This premise may have been unique and controversial when this book was written (1990), but since the end of the cold war the allied war effort has surely experienced greater scrutiny. In fact, the revised figures many scholars have produced suggest that even Ellis is quite generous to the allied war effort. That said, the premise may still be of interest to American and British readers who are often miseducated on the realities of the war in secondary and post-secondary level history classes.
There are certain other issues I have with the book. Most importantly-the lack of focus. Ellis spends the first fifth of the book discussing the German military successes of 1939-1941. This section apparently was to serve as a favorable juxtaposition of German military strategies vs the Allies, but Ellis spends half of this section criticizing German military strategies, and seems to suggest that German victories were based on luck and.. well, its unclear. Since he spends the rest of the book criticizing Allied strategies, the reader is left with the impression that the entire war was commanded by a group of fools. But other than failing to drive home his point, the lack of focus also make the book a slog to get through. Ellis often repeats himself, and meanders on tangents.
My final criticism of this book might seem quite harsh, but it must be said. The figures Ellis uses to analyze the war and produce his conclusions have come under significant scrutiny since then, and some figures have been dismissed entirely. These figures paint the German army as a titan, the Western Allies as well equipped, well directed troops ready to take the titan on, and the Red Army as a horde of untrained soldiers thrown into battle without thought. Ellis does dispute the former two myths, and admittedly does recognize the Red Army's fundamental role in defeating the Germans (rare for the time this was written.) However, Ellis still relies on German army figures for losses during the war, which have since been shown to be a vast underestimate. One can hardly fault Ellis for asserting the massive inferiority of the Red Army when the figures show 2.3 million German deaths compared to 13.5 million Red Army deaths. But the revised figures of 4.5 million Axis deaths on the Eastern front against 9 million Soviet KIA paint a somewhat different story. Indeed, more praise should certainly be given to the Red Army's ability to conduct operations on a wide front such as in Operation Uranus or Bagration.
Finally, the Pacific war effort of the United States is not granted nearly the amount of attention that the front deserves. Both the successes and the mistakes of the United States on this front deserved to be thoroughly incorporated in his thesis, but here they merely served as a perfunctory tailpiece.