AFAIAC, if Carey is not writing a TOS book she's totally slagging on the characters.
I've recently finished off all the novelizations so I could get them off my un-read shelf and into boxes to put in the garage, including several by Diane Carey, and all I can say is I'm glad that part of my life is over. I've heard she was the go to person for doing some of these novelizations because she could be expected to meet tight deadlines but the final product just didn't work for me.
I've only got 3 Carey books left to read but since they are TOS books I'm hoping they are at least OK. Battlestations!
, The Great Starship Race
and First Frontier