Their Master's War

Utter drek. I've read Armor, I've read Heinlein... this isn't even good 1970s military science fiction. The first section of the novel -- the bit where Hark is picked up from his primitive hunter gatherer life and deposited into an intergalactic war -- has nothing to do with the rest of the book. The characters are mostly indistinguishable. There's no humor, and a good deal of just plain bad writing.

Note that most of the reviews come from people who read the book when they were 12. If this book came out now, it wouldn't even rate two stars to most people.