Game of Thrones

I’m reading The Game of Thrones by George R.R. Martin.  I really enjoyed watching the first season (EXCELLENT!), but I’m having trouble powering through the book.  I’m not sure if it’s because I already know the main plot points of what will happen to the characters, or if the writing is a bit ponderous in detail.  The book is interesting and gives more detail then you get from the show, however, it’s definitely not a light read.  Has anyone else read it?  What did you think of it?