A classic sci-fi story from 1975, carefully crafted with great imagination and expertly told -- it's no denying that the way the various savage tribes and the colonizing "Land Barons" are described are deeply unpleasant when read with modern sensibilities, as is the story's underlying theme and message.
The whole thing is basically an elaborate "but the natives stole the land from someone first too, so that means our stealing of it from them is okay" argument from the less savory parts of Reddit, padded out with various racist tropes and straw men wrapped up in a story.
I wouldn't recommend this book unless you have a particular interest in the sci-fi of the era.