This is a really early anthology. Perhaps because the lore was still less set than it is now, the authors, some of whom are respected SF names and some of whom are classic BL writers, seem to have had much more freedom in telling their tales.
And the stories are really good! Sure it's Warhammer 40k with all its mandatory cheesiness and over-the-topness, but they're all satisfying reads. I liked that the majority were about humans and not Space Marines, although Word Bearers, Salamanders, and even Kharn make appearances. We have hive worlders, agriworlders, Imperial Guard, and press-ganged Navy ratings. They face off against Tyranids, eldar, warp-daemons and in one case even GIANT FIRE-BREATHING DINOSAURS. I mean, beat that.