On the whole, a fairly enjoyable book, a nice story, etc. There's a strong basic plot, a fair bit of adventure, more adventure/fantasy than typical Doctor Who Science Fiction. But still a good read.
Looking at other reviews its suggested that this isn't really the eighth Doctor, well... I can see McGann, but will admit, Tennant would suit the story far better - but there's no real tie to the McGann Doctor, it could, for the most part, be any Doctor, the odd description, but nothing really to make it impossible to picture any other Doctor in the role.
My main gripe was the form of the narrative, it got rather confusing and for the first few chapters I was a bit puzzled as to how the story was really going, later on I got the hang of it, but it's a rather abnormal narrative style. But a nice endearing story, which certainly tries hard.