I guess, one of the problems I'm having is that some of the storylines seem very strained. Littlefinger's Sansa plot just makes absolutely no sense. If his goal is to give Sansa the north by way of a victorious Stannis, why not just sit her safely in the Vale until Winterfell falls and then send her north? Why subject her to the Boltons at all?
The fact that Brienne has now run across both Arya and Sansa, and had them refuse her service, just sucks all the urgency out of her narrative. There is just no point to her anymore--particularly if, as I suspect, the showrunners aren't ever going to introduce Stonheart. They are trying make "avenge Renly, kill Stannis" her motivation, but it's just impossible to be anything but mildly annoyed about that, because Renly has been dead for many seasons (and was never like a fully realized character anyway).
I like Jamie hanging out with Bronne, but I'm not yet loving the idea to send them to Dorne instead of the Riverlands. The Dornish characters just don't seem very interesting now that Oberyn is dead. They don't add much. It's not like the show had a dearth of characters whose primary motivation is "revenge."