I haven't, in all honesty, been impressed by any of the books in this "Invasion!" miniseries; the first one was a tolerable action-adventure story with some ethical overtones, and so was a fair-to-middling idea, but it was written by one of my least favorite authors (Diane Carey)and so was barely tolerable; the second and third were better written, but just re-hashing of the same story concept and thus superfluous. This one was both superfluous AND written by one of the few authors I find even worse than Diane Carey, namely Dafydd Ab Hugh; he doesn't torture the language as badly as she does, but is just as sloppy in terms of accidental typos; in addition, he doesn't have the command of the characterizations that she does, and is generally a poorer writer in many other ways.
That being said, this was easily the best-written book of his that I've yet seen; it was mostly competent, with relatively few proofreading and editing mistakes, and the only character that I truly felt that he failed to grasp was B'elanna Torres (who, unfortunately, was one of the characters with the largest part to play in the book.) I know that she may, perhaps, have her insecurities, but I've never seen any indication that she suffers from an inferiority complex about her engineering abilities, certainly not to the extent that we saw in this book. But even this wasn't nearly as bad as some of the character mishandling that Ab Hugh has been guilty of in some of his other books, so I will stand by the statement that this is his best. Unfortunately, this is what is known in the lexicon as "damning with faint praise", as his others have ranged from "pretty bad" to "utterly worthless". Add that to the fact that I'm unimpressed with the concept for the series in general, (and to the fact that we get an "oops, we got out of a difficult ethical dilemma purely by accident" ending, and really, there's very little reason to read this book.