I also like ambiguous meaning (hope the meaning is never resolved).
Just before they jumped over the desk I was shouting 'Oh, man, this is so good' and then when they did - well, words fail me. It was tops.
I agree, it had width rather than depth, though John Simm isn't a superficial actor by any means.
All told it was My Kind of Show, but it might get on my nerves if it's not careful :-)
(NB I also watched a fantastic Japanese film called 'The Twilight Samurai' on BBC4 - highly recommended)
ETA - and the lyrics have been going through my head ALL DAY 'oh, man, look at those cavemen go' (mind, I think that every day)