This is more or less what I was going to say about Luther. I wrote it off after the first episode, and I've been out every Tuesday since then, but I caught episode 5, and I thought it was good. Not 'best thing ever omg', but good for anodyne BBC1. It's highly preposterous and melodramatic, like Spooks perhaps, and like Spooks it seems to rip along quite convincingly. Perhaps needs a broader cast? As I watched last night I promised myself to catch up with the episodes I had missed on i-Player.
ETA - amusingly they phoned Munch in New York SVU to trace a suspect, tying Luther into an ever-expanding universe of pretend police