I haven't caught up on the books and I'm still enjoying the show. After being bored with most of season 3 I learned to judge a season as a whole after it's done. The dorne plot line - every single thing about it - is just horrible. It's completely out of sync with the series. I understand all the limitations and difficulties of turning a very detailed book series into a show but it's just bad tv. All the other parts are fine, if not a little slow, but that's fine with me, I'll just wait to where it goes.
As for the sansa rape stuff. Yes the RW was clearly more brutal. But it was a huge twist in the plot. It made my stomach churn but it was a fantastic 'holy poo' moment. Sansa's rape just felt bitter and nothing else. It was like someone took a giant turd and slowly brought it to my face and rubbed it all over. It wasn't a big surprise, it didn't change the dynamic of the story, it didn't do anything really. It just felt bad.
The worst part of this season though is the thought that maybe the best part of this story is over and it will end badly.