I watched season four over the past few days, must say I quite enjoyed it. There was a fair bit going on in the last few episodes and some parts - like the Oberyn-Mountain and Brienne-Hound duels, and the defence of the Wall - were epic.
The conclusion with Tywin Lannister hit home pretty hard as well, harder than it did in the book.
Hoping Benioff and Weiss will sort through the stupid "double plot" structure of the next two books and put it all in chronological order the way it would've ideally been when Martin wrote it. Massive task though.