This book, is ideal for the younger generation, I tried to enjoy it, but the adult inside me wouldn't really let me (growing up sucks!)
The overall story is well written, and the enviroments are described just enough to let your imagination take over, which is always great in a book, you really do get a feel of the characters in most sense, although the constant reminders you get in what seems to be every chapter they are in, does get a bit tedious after a while.
The chapters are short, and the title's of the chapters give you a little hint, on what it may contain. Wether or not this is a good thing I do not know, but it will give the reader a sense of achievement, knowing they can read blocks of a book at a time which makes it very easy to manage. I can imagine younger children (who may not have much desire to read) picking this book up, read a chapter, then putting it down again, then repeating this every so often. Its a great technique that I have rarely seen in this sort of genre (fantasy / myth)
If you have a child that likes reading about Vikings, and other such, and doesn't mind a bit of gore detail, then I say go for it, they might like it, the characters are fun, the plot isn't hard to follow, and can be quite enjoyable at times, it won't be back to back humour, and it won't always be cheerful, but it is a nice read.
You really do have to be younger to enjoy this book.