Just finished season 4. Nice cliffhanger ending...
Observation: Not sure exactly when Netflix took over but I noticed that when they did, two things happened: First, each episode went from 45 minutes to an hour (I guess because they didn't have to allow for commercials) and second, instead of having a "murder of the week" that gets solved by the end of the episode, they went with longer story lines that cross over multiple episodes, more like other modern television dramas on Netflix.