It's about the execution (no pun intended). I knew Ned Stark was going to die, before the first episode aired last season. Yet the story was well told, and interesting, and yes, I didn't have to stand up and shout to the heavens when I saw it, because I'd already done that years before when I read it, but that doesn't mean I can't enjoy it. I knew that Frodo was going to make it to Mordor, too. Didn't stop me from enjoying the movies. (Plus, it's kind of fun to see the little hints and know what they portend. To understand Brans dream, for instance, or to know what Theon is going to do, and to see how the show creators portray that and foreshadow it).