I have it and I think it is a very nice book actually.
The marshal is just plain an incredible class. It can fit into just about any party and help them in some significant way. It has a great set of skills and decent combat modes. (I have seen 2 marshal pc's so far, one I made them a custom marshal prc that cut down on their combat ability and upped their aura powers and the other one is going warmage with 2 levels of marshal)
Warmage is very interesting, although in my opinion a bit over focused (duh, that is his point

).
The majority of the book is written for d&d, no porting of anything necissary. There are some skirmish rules that can be used in a normal d&d game but they are fairly lackluster.
All in all, I think it has a lot of useful ideas that can be pulled directly or modified to fit in most any game. Good resource.
However, there are other books with 'more' information in them relevant to the d&d game directly. Whereas you can use a little over half of the mini's handbook others you can use more than that. The info is good, but it may not have enough to make someone happy (I play the minis game but I still ignore the later part of the book, the first part is more than good enough for my money).