I loved it, although I always love the first four hours. We'll see where this takes us. I, too, wondered about the lack of military/police/security in the subway. Given the racial profiling theme of the episode, it seemed odd that folks could enter the subway and just mill about as usual, especially 2 middle eastern young men with big attache cases.
Of course, I'm a girl so I would love this moment: Jack finally is home after not speaking for 2 years and enduring horrific Chinese torture because of it, only to be told that the reason he's been released is to be murdered. His first word in 2 years is ...."Audrey".