I only gave this book three stars, but I can see how it would be 5 for the right reader. There's lots of action in this book, and it is fast paced. The recipe is: add bad guys, have a gun battle, blow a bunch of people up somehow, get injured, escape, rest, repeat. The author used to be in the military, so her gun battles are written very well. Back when I was 18-20, I'd have loved this stuff and probably would have rated it higher. So if you want an adventure novel where the lead basically has to shoot her way to the climax, stop right now and go buy this trilogy - these are your books!
For me, I do love action, but I need it to be set against some sort of higher concept. For example, in the movie the Matrix, there's a ton of fighting/shooting/etc, but that's only the icing on the cake. What that movie is really about is a world where humans are slaves to a machines, and are held captive in a virtual universe. So there's a much bigger picture involved than just a bunch of fighting, and that is what makes all of it so interesting. In this book, that higher concept just isn't present. The core of the story could have been set anywhere. It didn't need to be sci-fi. The author could actually have set it in modern times, or even on pirate ships. So that's the reason I knocked a star or two off - I really need a little more than just a shoot-em-up story. But that's me, you might be different.
I'm giving a review of the omnibus edition, since that's what I bought, but I only made it past the first book. I'm not sure if I'm going to read book 2 or 3, and I don't feel a huge hook to do so at this time.