Being a major Terry Pratchett fan, I was excited to find a book by him that I had never heard of in my public library. I wondered what sort of story it might be. Discworld? An imaginary group of people living in our world like the Bromeliad trilogy or the Carpet People? More like Johnny and the Bomb?
Well, it turns out it's nothing like any of those. This is Pratchett as an early writer, who's trying out serious science fiction. When I didn't care after 4 pages, and I hadn't laughed (or started to care) by chapter 3, I realized that no, it wasn't going to get any better. But I didn't give up hope, I slogged on to chapter 6, where I have stopped and don't intend to read further.
If you would like to do a study on his writing style and how it has changed over the years, go ahead and read this book. It's interesting to see ideas from future books coming through in this one. But don't do it just for fun, because fun is not what you'll get. If you like that sort of thing, I'd instead recommend you read the first 2 or 3 books of the Discworld series to see how much richer and more detailed it became as he wrote more and more about it.