I still think that the criticism of earlier episodes was overblown. They seem to fall into a few categories --
1) Abandoned/delayed plotlines -- it was made clear even before they started filming that certain stories would be pushed off as they were spreading the remaining book material over two seasons. Any criticism of what they have chosen to leave out is premature.
2) Dorne/Sand Snakes -- yeah, they kind of f&$ked that one up . . .
3) Deviation from the books -- their choices were to either stick to the books and have absolutely nothing happen all season, or pick and choose ways to deviate and consolidate stories in an attempt to move things along. They chose the latter, and other than the aforementioned Dorne scenes, most of the other criticism to me seems really minor. The killing of Barristan Selmy? I guess you could take issue with the believability of it, but it's not crazy to think a guy outnumbered 15-1 in close quarters might not win. The Sansa story? I guess it would be simple, if unrealistic, to have her just stand up to Ramsay and stab him in the heart. I suppose that they could have spent more time developing the background on the Faith Militant/Sparrows, but isn't that a really minor issue? They have introduced characters/themes without providing background in previous seasons as well.
I just think that there's an overwhelming desire to be the first to declare something to be not as good as it once was. Me, I think they've done a pretty good job cleaning up the mess that GRRM has left them.