It's very good for what it is, which is a book on running a game with a war theme.
It doesn't have a mass combat system, but that's okay, there are enough out there that if you really don't want to decide what happens for story purposes, you can find one to suit your purposes.
One of the things that I've heard is very popular is the vast appendix of stats for NPC soldiers. The PrCs and feats are okay, but not great (then again, how one can have a great PrC when it takes 5 pages and two sample characters to describe is beyond me, but that's a gripe for another time).
Brad