This (starred!) review from Kirkus has mild spoilers for the book, but I'll give you the summation: "Classic Scalzi space opera at its wisecracking, politically pointed, and, somehow, fiercely optimistic finest." I'll take it!
Kirkus Reviews
THE SHATTERING PEACE | Kirkus Reviews
Just like it says on the tin: Powerful and disgustingly condescending aliens threaten a fragile peace in the seventh installment of the Old Manβs...