Series 1 and 2 were brilliant. I liked all the characters and how they acted with each other. The stories were good, and the series finales were just out of this world.
Series 3 and 4? Meh. They were a bit more hollow. Moaned more. Just very annoying, and what was with the series finales? Terrible I have to say.
I will watch this one though, to see which road it goes down, who knows, it could be brilliant again and I wouldnt want to miss this!