I was very excited when I saw the trailer for this series a while back, I love this type of idea / story / TV generally.
Ep 1 was really very good, but I am afraid that if episode 1 was a 10 out of 10 rating, then the following episodes gradually go down in rating until the series reaches a low of around 4 out of 10.
As I said, the opening episode was gripping stuff, graphic, dark and intriguing. The premise of the story was very good idea (you will know the basic story by now) and I was interested to see how it played out. Unfortunately the episodes got clunkier and lost my interest with tedious goings on and some really poor decision making by the FBI (like 1 or 2 people going into situations that surely require a SWAT team!)
I thought Kevin Bacon was the best thing about it. I liked James Purefoy initially but after about 3 or 4 episodes he turns into a lovey actor that is annoying and comical in equal measure. You really needed to find him scary or menacing, but I found him to be neither of these and one of his followers, Emma was probably the scariest person in the show.
It is set up for a second season (aren't they always!) and I would watch it. I just hope its more focused and interested than what is essentially several kidnap stories one after the other.