This episode was mostly setting up the stage for the rest of the season. Which is absolutely fine for the first episode of the season
What I liked:
[splol]
1. Arya meets Lannister soldiers - I think it was a great move by the writers. Arya got to see that not all who serve the Lannisters are evil (which seems obvious to us, but as far as I recall, pretty much everyone associated with the Lannisters that Arya met up until this point was a cunt and she might have instinctively thought that "Lannister = evil") and that realization might heavily influence what she does later in the season.
2. Brotherhood Without Banners - the Hound wasn't as funny as the last time we saw him (shame!), but the whole setting was amazing. And I'm not even talking about the foreboding vision in the fire that Clegane had. The part that really got me is that I think that he was here before with Arya and that these people were dead because of the Hound (and that's why he was so uneasy coming back to this house). This whole scene, especially the part where Clegane digs up the grave and is genuinely sorry for the dead shows how much he has changed since the start of the series. And I love it.
3. Tormund and Brienne scene - it was short, but damn the look he gave her (again!) is still so funny
Also: "You are one lucky man" - lol
One regret that I have is that Tormund and Brienne didn't spar at least for a while.
4. Euron Greyjoy comes to King Landing - we all knew that he'd ally himself with Cersei, so no suprise here. Kinda funny that it seems like the Ironborn managed to build a ton of ships very fast, but hell... What I liked about this scene was that it showed how crazy and evil this guy is. I know Cersei was meant to be "the worst villain ever", but right now I kinda want Euron to die a bloody death more than her.
5. Little Bear being a savage again - damn the writers, I now want to see Lyanna Mormont kill some White Walkers.[/spoiler]
What I didn't like:
[splol]
1. Arya killing the remaining Freys - it feel it was a waste of time as they could have easily just have the part where Jaime tells Cersei that someone killed lord Frey and all his kin and we all would have known what happened. I guess it was a little extra something for the die-hard Stark fans out there.
2. Samwell - honestly... Stannis already told him that Dragonstone = dragon glass, I was kinda disappointed that this was the big discovery that Sam made. I hope this is only the beginning and he actually finds more in the books. The whole training to be a maester thing was cool, but a little too dragged out considering that we only get 7 episodes this season and each minute is precious. The best part about this was Jorah being in Oldtown - it's interesting to see what happens to him next.
[/lol]
The rest of the episode was okay
Neither bad, nor particularly amazing - pretty much the things that needed to happen to set the stage for the whole season.
For example, we had to see [spoiler]Danny land somewhere in Westeros, the beginning of Littlefinger/Sansa/Jon political game plot, Cersei and Jaime planning their moves, Jon making his first decisions as the king, Bran crossing the wall and so on.[/splol]. There were also some cool little moments like [splol]Cersei saying that Tommen betrayed her - I think she's starting to go a bit mad already[/splol].
Overall, a pretty solid first episode of the season. Bar the two things I didn't like, I feel that it did a great job of reminding a regular viewer of where we are and what this season is going to be all about