The potential misuse of 'literally', if the presumption is that Janeway didn't actually write a book about the Borg, still doesn't seem like something worth emphasizing in a novelization unless it's somehow going to be a plot point. Having Janeway think Barclay's an 'idiot' seems really disproportionate.
I'm not trying to put anything in her mouth here, but her dislike of TNG, which was where Barclay originated, is well documented, and it makes me wonder if she simply didn't like the character, that maybe she would have seen him as someone who should have been put off the ship, and didn't like him becoming a recurring character. Pure speculation on my part.
Yeah, Diane Carey in general is... not one of my favorites. Even when she was writing in her comfort area of TOS, there were things that have really rubbed me wrong. The Great Starship Race stands out for me on that side of things, where she had a major character who was NOT the book's villain being pro-confederacy without ever renouncing those views. Also there was a moment that had Kirk order a junior officer off the bridge for acknowledging that they were afraid, which just downright did not sound like Kirk AT. ALL. to me.
But I also get really uncomfortable with her writing a lot of the female characters - I don't think Uhura or Chapel ever have anything of significance to do in her TOS novels, and then in the novelization she wrote for Descent, she's uncomfortably close to undermining the whole Crusher in command plotline, that there's this sense of her trying to shove Crusher out of the center seat, when Jeri Taylor had done that specifically to test the waters of a woman in the center seat of Voyager, and even would go on to have Crusher established as liking command in later episodes of season seven.
And, I mean, don't start me on Ship of the Line, and the dismissal of Troi and the way that the fact that a character with deep trauma that SHOULD have taken him off active duty, but, no, we're not gonna have the therapist on the bridge... (Among the many issues I could go in to on Ship of the Line...)
I also really didn't like the way that her Equinox novelization kept referring to Seven in the narrative text as "the girl." It felt really infantilizing, since she was the only character being referred to like that. And then there's Fire Ship, which... I disagree with one of her fundamental ideas of the book, that Janeway is disconnected from the dirt and grease aspect of ship work, and that she didn't have that familiarity, when Janeway was commonly seen getting down in the proverbial dirt with her crew, that we saw her being involved in the work. So it just didn't feel like it was a story that really fit for Janeway.
Then there was like the one bit of original material she had for the DS9 finale novelization, where she had Kira loopy for the sake of the scene for no apparent reason and just... It didn't feel like a scene that needed to be there, almost like it was just there for the sake of having Kira being less than capable, and it's a bit that has bothered me since I got the novelization, when I was like ten, not even aware of her outside of her writing. Last time I was reading through my collection, I was also really unhappy about how she'd pretty much ripped out Kira's story in Rocks and Shoals, having everything involving Vedek Yassim happen off screen, when that was one of the most compelling parts of that arc to me, the exploration of the banality of evil and how inured you get to it being surrounded by it - has become a lot more timely. I get that in attempting to get the books out timely, some corners get cut, but that key Kira storyline got cut out while she added a whole storyline of Sisko playing chessmaster and deciding that, if he was going to be Ross's right hand, it was actually a grand plan of his, which also undermined his story in Behind The Lines, where he wasn't captaining the Defiant, and how that was actually the point of the plot line on screen...
Her view of Star Trek feels very "boys club," where the ones who are doing the important things in the narrative are the men.