HBO's new Game of Thrones series, which premieres Sunday night at 9 ET, is a TV fantasy epic with grand ambitions -- more mature than Syfy's Merlin or Starz's Camelot, less cartoonish and video-game violent than Starz's Spartacus, and telling a more complicated story, with a more sprawling cast of characters, than anything this side of Middle Earth. But even WITH a scorecard, which HBO provided me, it's confusing at times, and only occasionally satisfying...