I thought last episode was pretty good. Initially I was kind of upset because I really wanted to see a good battle for Casterly Rock, because I'm that guy that's like "OMG AWESOME BAttle"
But a few things I really liked:
Varys speech to Dany about supporting the realm, and also him threatening Fire Lady
Every scene with Olenna Tyrell is a great scene. Love that actress.
Clever move by the Lannisters to give up the rock and leave it with no food. I think the show has done a good job of evening the odds without anything ridiculous happening. It's feasible that the Greyjob fleet could destroy Dany's, and also the Lannisters have some great generals in Randal Tarly and Jaime and Bronn.
Thing I didn't like:
Why is Cersei and Euron suddenly so loved by the peasants? Cersei blew up the sept and most of the peasants loved that religion. Also, they were already starving before the Tyrell's brought food, now that the Tyrells aren't bringing in food shouldn't the peasants be starving again?