If you expected a minimum of fantasy, then your expectations were wrong (or misinformed).
The series only focus on some highlights and skip a lot of other storylines (and lands and folk).
What I really found odd, and somewhat difficult to handle is that some characters do different things in the series from books. I know of at least one character who died in the series but not in the book. Really, the series makers went really far with changing matters. I also know of a character that should be dead already according to the book but is still alive in the series.
Can't judge if there are too many spoilers but the book gives more. Besides quantity, it has different storylines, so it could still surprise you in some way.