After finishing Season 1, I was really pleased with the whole thing honestly. I already knew the places and people and the stories, which made me hesitant to watch some parts, I think it is around episode 6 or 7 when I hit the point where I knew "Ok, every episode is just utter horrible suck from here on out and everyone I like is going to be screwed." and I had to put a bit more effort into going to the next one. Even though you know the names and histories, seeing them so well portrayed really brings it to another level and also fills in a lot of stuff I was unclear on (I knew Arya Stark learned some Water Dancing and chased cats, but I didn't realize that Eddard set it up, making him that much more awesome and it happened in King's Landing early on).
Love or hate, I think all the characters felt well acted, except I couldn't tell if Denyras was a horrible actress or just ... I don't know. I just kind of wanted to fast forward over her. Especially come the end of the story, I kind of felt like the whole Essros thing was a waste of time and they could have said "Stuff happened, bitch got dragons" and gave us another two hours of Westros stuff.
Anyways, it was great, glad I watched it. It made me love everyone I loved more and hate everyone I hated more, with a few exceptions: I found after his exposition over the whore tryouts Littlefinger to be a bit more sympathetic, if a bit obsessed. Also I didn't realize how dreadfully mad Lysa and Robin Arryn are, christ. Sansa, I didn't realize has absolutely no redeeming qualities as well, ugh.
But shame on you all for not talking about this show more and letting me go this long without seeing it! I blame you all keeping this secret!