I hear a lot about changes in seaon 2.
If I had heard this in Season 1, I would have been very afraid. But I'm cautiously optimistic after the first season where some of the changes were definitely for acceptable or for the better (Catelyn not wanting Ned to go at all, added Robert scenes, Drogo kicking ass).
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http://img.imgcake.com/nio/51alecpngpa.png -Nio