A pretty generic but entertaining military sci-fi. I'll probably read the squeal.

Aliens invade, other aliens attack the invaded aliens and people are like "yay we're saved we love you" etc. Anyway from there on in the protagonist goes to fight for savior aliens on a distant planet (client species pyramid, we're at the bottom), and through a series of unlikely events he ends up saving the human race from this mess.

All of which is pretty predictable and generic, what makes it fun is that it doesn't take itself seriously, I genuinely laughed out loud throughout this book. It's silly, the characters are irreverent, and I think that makes it work.

It's still a standard but story and somewhat predictable, but it's amusing, and fun to read.