I agree with what most people have to say here. For me it was a great introduction into the written warhammer 40K universe, so if I would rate it just for me, it would be 4 stars. Yet, I also see some drawbacks. Let me list the positives and negatives:
+ Great collection of stories that depict a wide range of events with different races. I think there's something for everyone here, from straight up Space Marine vs Chaos battles, to an intriguing story involving the Tau.
+ Story length is long enough to get a decent climpse, but short enough so you will still give it a fair go, even if it isn't your favourite perspective.
- Without knowing the lore, you will be left in the dark for alot of the stories. The warhammer vocabulary is immense, and you will find a bare minimum of introduction into the universes background.
- I thought the level of English, for a non-native speaker, was quite difficult. I realized soon that this is just the way that these books are written, and I actually love it. However, I did get lost sometimes and think that will put off some potential readers. I would suggest to stick with it because if you find yourself enjoying these stories despite the thick web of lore and complicated terms, you will be greeted by an immense amount of GRIMDARK stories to delve into