I must admit I find amazon odd sometimes. Or more specifically, I find the reviews odd. I personally found this book thoroughly entertaining and was actually quite disappointed to finish it. I don't quite understand how books like the long midnight of Barney Thompson can be rated at 5 stars and a book like this only 4. Lets put it down to differing tastes shall we?
I thought enough of it that I bought Marc Blakes other two books on the strength of it. Although they didn't live up to the standard set by sunstroke, they were still thoroughly entertaining.
Sunstroke itself is probably never going to be studied by generations of future literature students as a masterpiece, but this in itself is a shame, as there seems to much emphasis on craft rather than entertainment these days. The ending is perhaps a bit predictable, but the characters are wonderful. Personally, I would say read it. It's really very good!