For me, this is a classic Scalzi oneshot book. Fun premise, snappy dialogue, snarky characters. There's a good quote in the Author's Note at the end about the process of writing this book, that I think describes the book really well:
As a writer I feel grateful to this novel, because writing it was restorative. KPS is not, and I say this with absolutely no slight intended, a brooding symphony of a novel. It’s a pop song. It’s meant to be light and catchy, with three minutes of hooks and choruses for you to sing along with, and then you’re done and you go on with your day, hopefully with a smile on your face.
I think that's both its strength and its weaknesses. It's not mind-blowing or overly complex--it's a nice snack of a book that doesn't overstay its welcome. I'm not sure it's what I'd consider a "Hugo best novel" and I also wish it had about 300% more characterization by volume, but it was still a fun ride.