All you've done is give me a general synopsis of the book. You still haven't told me why it's so interesting to listen to a character narrate his travels to me.But the book wasn't about the guy and his travels. Due to the effect on time that light speed has, he was not aging as quickly as those that he left behind. Whilst he was away fighting, everyone that he knew had lived their lives and died. When he came back, he had no choice but to rejoin and fight again and again.
Forgive me but it seems you are.Err because its good? Fast paced and compelling,so far. And I'm not easy to please when it comes to SF!