M.A.R. Barkers second forey into fiction in his fascinating interesting world of Tekumel is a nod better than his first in my estimation. The book and the world come across as more confident.
Tekumel is a fascinating world peopled by a variety of races, but dominated by humans who are descendent from Earth Humans, though principally through the cultures of South East Asia and South America. They thus have very little relationship to 'traditional' fantasy fiction in it's 'pseudo-european' mode and this presents elements that are at once challenging and fascinating.
For example, many of the principal characters in the novel worship a Fire Diety whose worship includes human sacrifice. The presentation of this fact, the disagreement in opinion between the religious fanatic who wants to burn everyone they can and the 'moderate' who will sacrifice a few prisoners but thinks otherwise is being excessive is very well done and like many other elements serves both to demonstrate character and to explain a world that is often very alien.
I think others, less in love with Tekumel, might find the book, with it's strange linguistic quirks, it's reference to elaborate history, and so forth, to be a bit challenging and perhaps pedantic, but for me it was great fun. Woven into these things is a sort of sword&sorcery adventure, in which a group of soldiers is ripped away from their home, must ally with their some-times enemies for a time, and struggle both to survive, and to out-guess their opponents before they return home. It was alot of fun and a good read for anyone who likes classic fantasy, or more properly, one who likes that sort of thing but would like to see the potential in the word 'fantasy' actually explored.