We’ve just binge watched series 1-3 in 2 weeks on the basis of a friends recommendation.
We are both really disappointed. The plot is weak and predictable, direction is poor one or two actors are ok
The whole of series 3 was full of irrelevant space-fillers with little progress in the plot. We found relationships largely implausible. I’ve seen on DigitalSpy that there is likely to be a Series 4 (there are loose ends to every single plot that there has to be) but we are not likely to be watching it !!!