Ok, I've just finsished Book 3... read all of them in about a week. First time I tried it a few years ago I got stuck near the end of book 1 but this time I simply couldn't stop reading. Great stuff, even better than I remembered. Can't wait for Feast of Crows.
Only thing I dislike is the very end of book 3... bringing Catelyn back as some sort of zombie kinda sucks, the character deserved better. I'm also not sure about Jon being elected head honcho of the Night's Watch, IMO it would have been more interesting of he had taken Stannis' offer. This makes me worry that he's setting up things to culminate in some sort of Men vs Others showdown which I'm not really that interested in - it's been done before a million times. Oh, and what happened to Osha and Rickon?
What I did like is the fact that GRRM is not afraid of moving the plot forward, unlike Jodan. He snuffed out half of House Lannister in a couple of pages, he wrapped up the King in the North plot line in even less pages and finally killed off Lysa who was a secondary character that really wasn't going anywhere.
I just hope GMMR doesn't make a habit of wrapping up story lines by simply killing the people involved. It's a bit of a cheap way out and sometimes I have the impression that GMMR started plot lines but had no idea what to do with them so he killed off the characters. Robb Stark (as perceived from the Catelyn POV) is such a case. If you think about it, the Red Wedding really just neutralized one of the strongest plot lines in the books and leaves me wonder why it was introduced in the first place.
That being said, I'd really be pissed if the Hound is dead for good. There are just too many loose threads with this character.