Agreed.
The casting done by Nina Gold & Co has been almost perfect on this ensemble show.
My one concern, however, is that with the departure of Sean Bean and Mark Addy, the show lacks a big name star. Dinklage and Headey are accomplished actors -- but they aren't "stars" like Sean Bean is.
I had thought that the logical place to remedy this was in the casting of Stannis. Don't get me wrong, Stephen Dillane is a fine actor and I don't take any issue with his skills. At all. I do, however, take issue with the "draw" that his name adds to the cast, or rather, the lack thereof of that "star power" big name draw.
It may be that D&D have decided that the "story" is the star of the show and that any money saved on the acting budget for not signing a "big name" star will be money that ends up on the screen, most especially in terms of visual effects and the ability to show some CGI battle scenes, CGI wolves and, of course, the dragons. Given the success of Season #1 and the enormous impact that success has had on the sale of the novels, they may well be right. Perhaps George RR Martin and his story is the real "star" of this series.
Still, the lack of a big name star is of some concern to fans who want to ensure that the series gets renewed again (and again, and again. etc.).