I think this is more a man's book than a woman's. Lots of fighting, blood and violence. I felt the characters were a bit one-dimensional, however once I started I finished it. Some books I don't want to waste time reading after the first few pages, but this wan't one of those. So........ I would say try it; see what you think.
Mmmmm.........I've just finished reading this book, and I really don't quite get it; all a bit surreal. (Hitchhiker's Guide-ish?) However, it's a jolly romp with some rather clever little elements - I liked the eventual fate of humanity! I actually quite enjoyed reading it. Not the best book I've ever read, but certainly by no stretch of the imagination anywhere even remotely near the worst.
I can see where the link to the scars changing one's life comes from, but the story didn't quite live up to the blurb, I'm afraid. I don't agree that it was boring; rather, it wasn't particularly fast-paced. I quite enjoyed it though, despite the ending (or lack of 'proper'ending).