I’m super behind. Forgive the brevity.
This one’s easy: If you love the Old Man’s War universe, then The Human Division makes a tasty read, but I wouldn’t jump in here as a first venture. This time the shenanigans are mostly political instead of military, but our hero is still one of the genetically enhanced soldier types like those that staffed OMW itself. Lots of wry dialog, plenty of nerdy sarcasm, and a generally rollickin’ good yarn if you like this sort of thing.
My sense is that Scalzi is capable of much more “serious” writing, given his resume (and his work at Whatever). I think I’d like to see him stretch his chops and venture out of this witty-SF category and into a different world, just to see what he could do with a less completely genre work. My guess is that he’d do just fine, which is more than I can say for lots of SF types.
Anyway, a fun book. Enjoy.