I was b*tching during all season 3 for the writing and the direction of the show (I still think I was wright to do so).
So far the 4th season is the exact oposite, for me its like watching 1season quality again. I guess it helps a lot that its the final season, the writers don't seem to be lost and confused as they were last year.
The acting is top of the cream, directing is great, the show is quite dark and daring, editing is also better as episodes seem to have an better rythm, the story is intriguing, I can't wait to see how it will be developed.
If things keep going like that, we will have one of the best tv seasons of any drama show ever(crossed fingers).
I would advise people to stay spoilers/trailers/teasers free. It makes the experience of enjoying a show like that so much better. I was looking for my jaw at the end of this epi...shocking!