And about watching it by knowing how the story more or less goes, it doesn't really matter, otherwise people who have read the books would not be able to watch it, since we know what's coming (even if at some point we believe a different thing is going to happen next)
People who have read the books have already experienced the entire story in its full glory, progression through the story without knowing what will happen next. Watching the series afterwards is nice because you see it visualized in a different manner than you did in your head. This isn't a damn sitcom, just hopping in and watching some episodes messes with your first experience of the story.
Also, Sansa and Daenerys both do very little for me, but perhaps I cant seperate my despise for the characters they play from my evaluation of their looks. Margaery however, with her weird-ass crooked face and sexy dresses, gaaawd.