I read this book at a local library when I was probably 10 years old or so. It has stuck with me through memory and dreams ever since. I have forgotten the names sometimes, and the resolution to the plot and it's antagonizing events, but to this day I remember the crippled monk and the warrior woman, who journey together and fight against the coming of ragnarok.
For the impact alone I'd give it 5 stars. Since I don't remember it perfectly, and I have not been able to find it anywhere after my initial read, consider this a 4.5
I'd definitely read it again.