I myself am a big fan of the series (books and TV) and the theme is really implemented very well in this game. Anyway, you can recommend this game only diehard conquest game fans. Just as in the series, alliances form a single fraction eradicate. In a game that lasts as long as this, it can be frustrating to be driven in the first 1-2 moves into a corner, that you have to watch the rest of the game as an extra.
I would the statement, this game is a must for any fan of the series correct the statement: "This game is a must for any fan of conquest games (Risk & Co) of something for 'Song of Ice and Fire' to spare '. Just to be a fan of the series is not a sufficient criterion.