I don't mind a slow paced story, as long as plot or characters' development depend on this slowness. In this book, it's a stretch, a kind of exercise in style by the author because the pages are filled with descriptions or insignificant facts, but then, the major changes in the characters' life and psyche are told at the speed of light.
Similarly I can appreciate the paranormal genre, but it must have some consistency. The author likes to repeat that the ghost doesn't have the most basic physiological functions (a digestive system, for example) because they are difficult to recreate, then how is it possible for him to have a nervous system that allows him to see, to hear, to experience pleasure, etc.? Again, adding not required details, the author forced me to do something irksome, that is, suspend my disbelief more than absolutely necessary.