I know Asimov hated his novelization of the original Fantastic Voyage movie, given the constraints put on him by the studio, but this near-incoherent mess is much, much worse.
The original book at least attempted to make right a few of the plot holes of the movie. This re-imagining of the whole story is disappointing; it’s one thing to make sure your science fiction is believable, but when you almost have nothing but scientific exposition to move the story, there’s not much fiction to be had. Adding that together with characters that are complete cardboard stereotypes and an archaic Cold War plotline (even from the time it was written) makes for an extremely dull read.
Asimov is supposed to be so much better than this. And considering how cool the original movie was, this was a major disappointment.