I realize now that beginning to read this book the same day I finished "Accelerando" was certainly a mistake but it's giving me a serious case of the blahs. I don't hate it, it's not terrible or anything, I just can't find anything in it that impresses me particularly or that I haven't seen elsewhere. In fact I wondered for a bit whether Scalzi might be a non-SF author coming to the genre with a bag full of tropes he didn't know we'd seen before. To be fair it is a first novel.
It's not the subgenre, I've read and enjoyed Elizabeth Moon's Vatta's War series and other military SF. I loved the Haldeman's Forever War and Forever Peace. And it's not like I dislike Heinlein, for that matter.
I feel kinda bad at how underwhelmed I am. Then again, I truly hated a few of the short fiction nominees, so... "de gustibum"