Season 1 was surprising and exciting. Season 2 still interesting. But it is good that they stop after season 3. The stretch is out and the storylines are on.
I gave the series a 9 and it will stay that way. Only the third season was disappointing. The speed was gone and I fast forwarded many a passage. However, Part 3 wasn't so bad that I decided to quit. I was curious about the end.