I haven't been writing many full reviews because I often feel there is little I need to add to what others have already said. But, in the case of the Micronauts trilogy, there are not many reviews. Especially for the second and third books! This is not surprising for an old and inconsequential novel. But since I grabbed them off the shelf of a local used book store and enjoyed them enough to finish them, perhaps my thoughts might be useful to others. I'm covering all three books in this review and crossposting it under each.
I enjoy novels about the exploration of frontiers and also tiny people dealing with massively oversized everyday objects. I picked these books up assuming they would cover those interests, based on their titles and cover art. There is some of that but not nearly asuch as I expected. Instead, in the way that sci-fi uses it's imagined future as a tool to discuss the issues of the present, Micronauts is actually about the intersection of governent and science as well as the struggle between control and freedom.
The novel's micro-sized characters spend most of their time in settings that are engineered to be proportionate to themselves. They are isolated from the fact that they are tiny (until something unforseen happens and they must deal with the chaos of nature).
The first book, Micronauts took a very long time to get going. It may be easier to think of it as a prolonged introduction for the second and third books. It also is very tropey, with a main character who is the cliche Science Hero. But don't worry about it too much, he gets better.
The sequel, The Microcolony, is where the real story starts. It feels more complex and compelling. I knows what it wants to be. It is probably the best book of the three.
The final book, Revolt of the Micronauts, is kind of just The Microcolony Pt 2. It works hard to tie narrative threads up into a satisfying climax. Also, some micro-folks are apparently developing psychic abilities now for some reason? The writing feels a bit rushed but if you enjoyed The Microcolony, it's worth reading this one too.
Is this trilogy a hidden gem or must-read for every sci-fi fan? Absolutely not. But they're fast easy reads and enjoyable enough. I don't regret the time I spent in the microworld of Arcadia.