There are a number of places in which DOMINION demonstrates the fact that this is Nick Walters' first solo novel. The narrative is a little unsure in areas, as if he isn't absolutely certain how to express his story properly. And yet in other portions, the prose seems almost effortless, as if he's swinging back and forth between doubt and confidence. Despite these problems, this is quite an enjoyable, if relatively simple, tale.
It's obvious that Walters has put a lot of thought into the characters and world he has created, and the results are well worth it. There are a few places where the characterization appears slightly off and a little unrealistic, but overall the effect is quite good. With the exception of a few UNIT soldiers, each person's motivations are carefully considered. Back-stories are worked into the narrative with meticulous detail making even soon-to-be-brutally-killed characters seem interesting. The plot is a little thin and there is an awful lot of diversionary material present. Fortunately, while the padding may be thick in places it's all padding of the highest quality.
As I mentioned there are a few new-author problems with the book. One of the more irritating aspects of the story was the "information dump" that kept cropping up. Upon encountering someone who had not been present for a sequence, a character would be quickly brought up to date with what was going on. This was usually handled in the clumsy, "X quickly told Y about their adventures while Y looked incredulous" manner that got a little irritating after the fourth or fifth repetition. There are better ways of structuring novels to avoid this sort of thing, and at these moments I was reminded of the old Target novelisations. Still, this is a just a minor concern and something that will surely disappear after Walters gains more experience as a writer.
As for the regulars, the characterization of the Doctor is something that I found to be something of a mystery here. He's much edgier here, bringing out the rougher, harsher aspects of Paul McGann's TVM portrayal, yet he stands by the wayside here and gets almost nothing done. On the companion side of things, Fitz gets most of the face-time and Sam is sidelined for the majority of the book; these two things are definitely a positive development.
All in all, this was a good read despite the minor quibbles that I mentioned here. Recommended.