Actually, anybody who read Gerrold's two nonfiction works for Ballantine (The World of Star Trek
and The Trouble with Tribbles
) instantly recognized exactly what The Galactic Whirlpool is: it's a reworking of the very first spec outline he pitched to Star Trek
, originally titled "Tomorrow Was Yesterday," with the title plot element added in order to provide the story with some much-needed jeopardy.
As to The Starless World, World Without End,
the ever-popular Devil World,
and Perry's Planet,
I've always regarded them as the least-
worthwhile of the Bantam ST novels, all of them variations on the "Kirk & Co. get themselves in trouble with an alien civilization that turns out to be entirely different from what it seems" cliche.
I liked Death's Angel,
with its comic-relief ambassador names and its "Special Security Division" (which anticipates Section 31, among other things). And Trek to Madworld
was a comic romp of the sort we wouldn't see again until How Much for Just the Planet
I'd say that the two "Phoenix" books' biggest fault wasn't the K/S elements, but the fact that they were so damned confusing.
All in all, I find the best of the Bantam novels to be better than a lot of the first dozen or so Pocket novels.
And I've never gotten rid of a Star Trek novel unless I somehow acquired two of the same title.