I just felt her work never did the characters justice, and the novels you mentioned are amongst my least favorite works of Trek fiction. IMO.
I recall The Murdered Sun and Marooned as being much better than many of the other numbered VOY novels, but utterly forgettable as time has gone on. Seven of Nine, though, was great, at the time, and I was surprised that Golden was able to extrapolate so much of Seven's early life when it was probable that the show would want to do its own flashbacks to that period.
Where I felt Golden first faltered was her "Dark Matters" trilogy. A few interesting characters (eg. the returning, canonical Telek R'Mor) tossed into a slow-moving mess of techno babblly plot - suddenly it felt, to me, that everywhere I turned, someone was discussing "dark matter".
I didn't mind "The Last Roundup" hardcover (I'd forgotten she was the author of that one) and her "Double Helix" contribution - but please don't remind me of her "Gateways" Q story. Ick.