What about her novels appeal or does not appeal to you?
When I was a kid, Final Frontier and Best Destiny were some of my favorite novels; I thought Diane Carey had a great understanding of Kirk, though her naval terminology threw me off... to much nautical stuff... but her characterization was pretty good for the original crew ... not so good for the TNG crew...
The book series that I couldn't quite get into was the Belle Terre series. I felt the story only sympathized with the colonists' perspective, and was not giving the Kauld side, the arguably indigenous people in the area. How did the Kauld feel about the Federation moving into their area and taking away planets, when their own planet and people were dying from an environmental disaster (if I recall the storyline correctly)? I would have liked to have heard more about their side of the tale, but that's just my personal perspective... I felt Kirk didn't really do much to understand the Kauld perspective of the Federation moving into the area, which I found surprising, considering the revelations he had discovered about the Gorn perspective to a Federation colony moving into their area in the TOS episode, "Arena".
I really enjoyed Carey's excellent entry in the Invasion! series, where Kirk encounters the Furies, an ancient race that ressembles monsters out of Earth mythology and claim they once controlled much of Beta Quadrant. I was impressed by how much Carey presented us with Kirk as a diplomat, trying to understand the perspective of this alien culture. I found his attitude here very different that the way he acted in the Belle Terre series towards the Kauld ... he seemed much more the explorer in this book, willing to communicate, even though the Furies represented a potential invasion force threatening the Federation. Then again, the Furies were written as much more willing to communicate with Kirk and the Federation than the Kauld were...
Overall, I have enjoyed most of her books, and wished she would return to the Trek book series...
