This is a harsh rating, and if I could do so on goodreads I'd really like to award it 2.5 stars, but if I have to pick an integer number then a two star review it is.
That's not to say that most of The Guns of Tanith is bad, at least by the standards of 40k fiction, because it's not. As always with Abnett, the little details of worldbuilding add up to paint a wonderfully rich picture of day-to-day life in the Imperium. The preparation for the grav jump of Operation Larisel, the ammunition woes of the first assault, the smell of the loxatl, the fire detail teams responding to the bombing. These are all great, and in a way if Dan Abnett wrote a Yellow Pages of a hive city, crammed with little details like this, I'd probably give it 5 stars and buy the £200 collectors edition with genuine wax purity seals.
The problem lies in the story beats, and the broad overall story structure. The book is basically split in two, detailing Imperial assaults on two settlements in the clouds. One of the major problems is that the events of the first assault have little bearing on the story structure of the second assault (apart from informing how the assault is structured). Being so disjointed definitely robs the book of the flow of, say, Honour Guard or especially Necropolis. Secondly however, and this is the bigger problem, the book exemplifies a lot of what I don't like about the series. Yes, Gaunt's Ghosts is basically Sharpe in Space, but the degree of melodrama (specifically here I'm referencing Kolea #nospoilers) is to me unforgivable - it broke the limits of my suspension of disbelief. And not giving into the melodrama would have made the story more compelling and shocking: having Kolea not have that particular event happen (#nospoiler) would have been a great fake-out for Bragg having that event happen to him instead (#nospoiler #ohgodwhy). It's difficult to take the events of the series seriously when the characters are acting out a plotline that feels ripped from mid-90s Neighbours. Additionally, the book suffers from the perennial problems of the series: no compelling villains, and an all too abrupt ending of the main antagonist who we barely knew at all.
The structure of the book is a mess, with some lovely moments and character details to offset it, but ultimately it just doesn't quite succeed. Though Mkoll being Mkoll is always great to read, so no complaints about that subplot. The rest of them can get in the bin though. Perhaps instead of this you should read Double Eagle, also by Abnett and featuring some of the same characters, which is the Battle of Britain... in spaaaaaaace. It's great.
So apologies for the heavy rating, but this installment in particular is, to me, all about the weak points of the series.
And, as always, feth you Lijah Cuu.