I also read it before I saw the movie, and I agree it is an excellent novelization. I generally like JM Dillard's work, and especially when she did novelizations that were sooo expanded from the source material. There's so much extra in TFF, and some nice added bits in TUC (although I mostly see complaints about her additions and changes there). The high point with her was a 400 page novelization for the movie length War of the Worlds television first episode. The last of her novelizations that I read was for the opening DS9 episode, at which point for some reason my interest was waning. I was disappointed by how her novelizations for TNG movies became shorter and shorter...and I compared them to that monster 400 pager of War of the Worlds and wish it had turned out differently.
From what I can recall, the novel for TFF draws on Hikaru Sulu's backstory from The Entropy Effect, Sybok zooms in on a bad incident from his childhood. I'm keeping it in mind for a reread, too.
Yeah, her book for TFF explained quite a bit...how the Enterprise (and later Klingon Bird of Prey) were able to get to the center of the galaxy so fast, and how Sybok designed a way for the shields to protect them. I remember she even explained what Gillian Taylor was up to since she was brought to the 23rd century, it provided some background on Sybok, and yeah, it showed us the pain of other crew members.
Her TNG-film novelizations were ok. But not quite as good as V and VI. One thing I liked about her novelization of First Contact is it gave us some more background on Cochrane, and partly explains why his behavior is somewhat erratic in the film....and she even gives us a glimpse into that event frequently mentioned but hardly covered, World War III.