It's a TV Series that's truly distinct from any other you'll see... Its content (i.e. the story, the visuals, the conversations, etc) all make for a riveting series. Some critics take issue with the excessive scenes of violence and sex. Personally, I don't have any issues with any content that illustrates the good, bad or vile carnal nature of human beings. To me, such inclusions simply adds personality to the characters, most of whom are far from simplistic or without purpose.
Game of Thrones is one of the best TV series I've seen.