Fantastic episode. I think the pacing was a tad too fast for my taste, but it would be hard to do otherwise. There was so much needed in this episode in order to set up the coming season, things had to move quickly. I am surprised at how great the direwolves and dragons looked. Great CGI. Few moments where they were a bit iffy (especially with the wolves; all that fur), but they were few and minor.
The only real complaint I have is the placing of the Dragonstone scene. I think the episode should have started with that. But, regardless, it was very well done. Dragonstone looks almost exactly as it did in my mind, and all of the new characters have been cast perfectly.
Overall, it feels great to be back in Westeros.