I loved the series although MC Hall's British accent was awkward! The series gets nicely complex until Ep 6 when the underlying thread becomes evident and thus predictable ending even the final twist was seen a mile away. That said, it doesn't take away from viewing as it still engrossing albeit you know how it will end.
It is also clearly a British production which is far superior to any US broadcast network junk one sees on major networks.
All in all I recommend watching it