If I were only rating the first season it would have been an 8. Unfortunately, the show falls into two traps. The first is the concept of danger driving the plot, the second is violating the internal logic of the first season which was quite clever.

The second season is quite repetitive in its episode structure, and the third season is better but it becomes rather sanctimonious and saccharin.

Watch the first season and enjoy it, it's great.