I feel the same, it's the worse season yet, it just drags. I'm not sure if they are trying to portray a build up but if they are it isn't working. There is no tension and nothing that really keeps me hanging, it just plods along following the boring story of arya and hound yomping across the country, dany flitting around the slavers and the lannisters doing little at all. It feels like the filler part of an incredibly long movie.
/whinge
This isn't new!

The problem imo, is they have no idea how to adapt it. Picking up the story from after battles for example works well in the books as you have Martin's writing and characters to pull you through, but it just doesn't work on TV...The old adage is 'Show, don't tell', and this series is awful for it. Daario basically looks in to the camera and says 'I captured 90 ships'...what, not gonna show it? How about him on a ship? or even just a glimpse of some of his men or a scene in the harbour?...Same in season 2 where Bran wakes up and Theon literally looks straight in to the camera and says "I have captured Winterfell" Works in the books as you are seeing it from a specific POV, but it should have been expanded for the show.
As for Arya/Hound...I would struggle to summarize what they have done this season. Their characters haven't progressed in the slightest(but then, you can say that about quite a few).
Having said that though, I thought this was the best episode in a while, even though it was mostly filler that meant nothing.