I loved the podcast, but there is something huge that I disagree with.
Joffrey's characterization. Yes, it's more erratic and a bit more crazy in the show, but I think he's far more cruel in the books. There's that whole prostitute scene, which is very disturbing, and the Ros thing in the TV show, but in the books he's -far- more ruthless, such as arranging to have his guards beat Sansa constantly for reasons as little as disobedience and at times even no reasons at all. He just has her beat so that he can keep dominance over her. And as for something you all shot down, Joffrey -does- say in the books that he wants to have Robb Stark's head served to Sansa at Joffrey/Margaery's wedding. Joffrey in the books isn't as crazy as his tv show counterpart, but his cruelty far more than make up for that.
Sansa's characterization is something that I agree on, though, but honestly, Sansa is both a boring character and a terrible one. She was still boring in the show, as she was broken pretty quickly, but she was an annoying character in the books to read and even with the small amount of character development, I still didn't like her all that much. And in the books, she's just plain vicious at times. At least in the show, she's less that and more just a big sister.
And on the topic of characterization, I'm guessing that George R.R. Martin is setting up Theon to have a huge redemption plot, but I think it's a little lost on the tv series. Theon's just not a dick like he is in the books and I thought the betrayal came a bit out of left field. It made sense in the books. He never felt too much love for the Starks and was harsh in behavior towards them and anyone. In the show, he's not that. Sure, he's kind of a prick, but no more than anybody else is. In the show, all the feelings just come out of nowhere.
Don't get me wrong, though. I absolutely love the show and have enjoyed every single episode. The show just has to take a bit of liberty due to the nature of how tv shows work.