Rough episode that was very frustrating. They tried to do a bunch of things that made sense on some level, but then they completely botched the execution.
Dany doesn't want to burn down all of Westeros on her way to ruling, which isn't unreasonable. I doubt that will work in ASoIaF, but it's her call to handle it this way. She makes this decision, but then the plan to split her forces doesn't make much sense, and they give Emilia Clarke a bunch of dialog that she couldn't handle in the war room scenes.
Grey Worm and Missandei pursue a relationship, which works for me to show some of the human side of things admist all of this conflict. But then they move from some meaningful dialog (well acted, too) to another gratuitous T&A scene that flattens any resonance that it had.
A large sea battle between Euron and Yara was probably going to happen sooner or later. But they jump into it without much thought as to how he tracked them down, and then their huge set piece for the episode was messily edited to the point that it was difficult for me to follow parts of it.
Just a sloppy letdown after the solid premiere to the season. At least the Arya scenes worked for me.
This is probably useful if recut/spliced in some way:
More gifs here on GoT's giphy account.