This book was undoubtably very well written - its prose is of a far higher standard than most other Trek literature. The characterisation is also of substantially higher quality, Chakotay in particular becomes far more 'real', Tom and B'Elanna are well done and Beyer seems to have a much better grasp of Janeway than many other authors.
Jumping back and forth between time periods, giving us brief glimpses of what is to come then returning to fill in the details in the lead - up works very well in Full Circle, Beyer seems to be extremely skilful, just telling us enough to whet the appetite whilst not confusing us in the slightest. I don't usually favour such a style but here it seems to be done to such a high standard that it is extremely effective.
Having said all that, I can only give this book two stars. I would have given it just one had it not been so well written. I could not enjoy a book that destroyed so much of the TV series I have loved so much. I can see why people who were perhaps lesser fans of Janeway, or lesser fans of Voyager in general may enjoy it, but for me killing off the main character is just a step too far. The whole point in Voyager was for me was that these people were trying to get home so they could build new lives, not have them cut short. Likewise the other events such as sending Tom and B'Elanna away from the Alpha Quadrant forever seems like a proverbial slap in the face after the TV series which was focussed on getting the whole 'family' home - it is as if some of the achievement has now been undone.
Grief forms most of the second half, mainly Chakotay's but also touching on the feelings of the rest of the crew, which for anyone who has felt any fondness for these characters makes painful reading indeed. Some people probably like that sort of thing, but for me that is not what I want when I grab a Star Trek book from the shelf - I want action and interaction, not pages and pages of tragedy.
If you enjoy good writing and deep exploration of feelings then this book is probably for you. If you want to see a Star Trek book written to the standard of good literature again this may be well worth a look. However if you want a standard Trek novel with action plot and heroic ending with all the characters intact it's definitely not to be touched with a barge pole. Particularly for Voyager fans who want to leave their crew successfully home from their seven year odyssey.