My own first reaction was rather startled, but I actually think he HAS changed the direction of a few things. See for example this. And he also most definintely seems to be changing the direction of nuclear policy, bringing up the little matter of the long-neglected treaty commitment of nuclear powers to de-weaponize--something that a lot of Pakistanis and Indians pointed to as rank hypocrisy when they were being asked not to test their deterrent.
On the Nobel, of course, I think Ali Eteraz spoke for a lot people from the wrong side of the global tracks when he described the Nobel Peace Prize as "not a real award," adding that "It is mostly Euro-centric bloviation. Kissinger got it. Arafat got it. Now shut up and enjoy the word play."
I personally feel that the Committe does like to influence the global conversation, and they seem to be throwing their weight behind what Obama is starting to do, so as Eteraz puts it, "if we can have pre-emptive war we can have pre-emptive peace."