I have been waiting YEARS for this to finally happen! LOL. Die hard fans have know for years that HBO was working on it. I can't tell you how fantastic is to see it "live".
The casting hasn't let me down yet. Wonderful talent. And yes, it sticks to the books quite well. What isn't conveyed are the thoughts and feelings they have though (a hard thing to do) but you really don't get the feel for the danger they are in, who they trust and don't trust, etc. The book goes into it in much more detail.
The upside to it is that for people who haven't read the series, this series is FULL of surprises and turns.
The sex scenes in this series have been tame, in my opinion. Compare to previous series like Rome and Spartacus, where I felt it was for truly gratuitous purposes, hidden under a banner of (but that's how they lived). A Game of Thrones has most of those sex scenes and nudity written within the books. Notice I say most...the discussion between Littlefinger and the prostitute from Winterfell isn't in the series.
I love Tyrion and I think he has truly been brought to life. Better than I ever imagined from the books. There's a truly human and heartwarming side to him - more than I had thought possible. I have Peter Dinklage to thank for that. He has been absolutely Amazing. I love Jon Snow on principle, but Tyrion is brilliant.
Can't wait for the rest! So happy they've been picked up for another season!