Not sure what everyone else thought, but I thought the 2 part season finale was really good. Not as good as season 3's which was one of the best episodes in television history (imo), but I like the direction they're going. Could be 2-3 more seasons now, which if I remember correctly Sutter planned for 6 (or maybe 7).
I should also mention that I'm glad they are going this way (possibility for 2-3 more seasons) as I thought this season was by far the best, and by a large margin.