Each TV season is about 1000 pages of text boiled down to less than 10 hours of screen time. Given the circumstances it's about as faithful as it could possibly be.
That was actually the biggest problem I had with the TV show. I loved the books, but watching the first few episodes I was constantly thinking either "I remember what happens next" or "Oh, they left out xxx". I gave up after episode 2, despite the excellent Peter Dinklage.
Returning to topic, I can see snow on the mountains. Looks like Winter is coming, HBO.