Played with a full group of 5, using the boxed set with 'bonus' decks.  We went an hour and change over our 4 hour slot, and everyone involved agreed to move the game-in-progress to a new table in order to finish it because of how deeply invested we were in the story we'd made.  I basically cannot fault anything about this 'fusion' story-game, and am eagerly awaiting my own physical copy.

Fusion is the phrase I'll stick with though there's maybe a better term... essentially this could function as a game with cross-over appeal to board-gamers, roleplayers, improv artists, card game enthusiasts, and the general public (a person off the street with familiarity with Game of Thrones and no other nerd culture intersection would feel at home within the fictional space in this game).

Caveat: This isn't a roleplaying game in the traditional sense of supporting a long campaign that meets multiple times over the course of months.  You'll play it once and have a complete story.  That's part of the magic though, in my opinion.  It compresses the plot beats of an intrigue-laden story full of passion, sword-play, and betrayal into an afternoon's entertainment.