Old people go to war with aliens, no one under 75 allowed! And it is as fun as it sounds.
Humans can travel in space and have found other lifeforms but they don't like us. So we have to fight them all over the universe in epic wars with super advanced technology. What is there not to love?
True, characters come through a bit one sided, and the main character is you standard generic male hero who just excels at everything he does, but this is a fun action packed and surprising story.
It may lack on deep philosophical issues, but it has some good and interesting ideas about the meaning of tech and the comparative ease of going to war instead of going through the effort of actually understanding Others and communicating with them.
It is the beginning of a trilogy. And I am looking forward to the sequel, the Ghost Brigades.
I will not spoil it, but I definitely think this book is entertaining and curious. Worth a read, especially if you are into aliens, space wars and old people flying around all over space. ;)