"Underwhelming" is decidedly the word that pops to my mind a lot lately with Game of Thrones, especially with this last episode.
I think they handled changes with major events from the books pretty well (the Brienne and Sandor thing was really cool) but the overall directing/screenplay feels duller and duller to me. Shae and Tywin's murders lacked impact, probably because of the dialogue. There was none with Shae, which I think was a mistake, and the Tywin scene kind of missed the point, as Ewing pointed out. Maybe they didn't need to use the Tysha story, but they really could have done better if using only Shae.
This particular chapter is among my favourites in the books, because it's a huge payoff to everything Tyrion has endured beforehand. The dialogue in the book makes it the last straw for Tyrion; the show makes it somewhat cold-blooded.
Don't get me wrong, it was still a good episode. But I was expecting it to be more than that.