So will we take to calling that opening sequence the Red Feast? That scene was certainly satisfying from the standpoint of some righteous vengeance being dealt out. But the "Previously on Game of Thrones" segment just before the cold open flashed back to Arya dispatching the late Lord Frey at the end of last season. It let the audience in on what was happening, and that it was Arya disguised as Walder Frey from the get-go. The only thing it really served to show is that Arya has been trained quite thoroughly as one of the Faceless Men, and that the Freys are no longer a house that has to be contended with.
Mostly? This episode seemed like an exercise in plate setting, and getting things established. But Euron Greyjoy trying to court Cersei? LOL! That's going to be strange at best, and even Cersei called out Euron when he came to court. But will that storyline potentially involve Euron getting the Valyrian dragon horn, like in the books? If that's the case it may develop into something interesting.