IMO all the NBC new shows are duds, but I suspect they'll all be around for a full season since NBC has so little else to offer the viewing public. Moreover, many of the new CBS shows appear to be hits (Person of Interest, Unforgettable, A Gifted Man) but the network has a habit of cancelling series with 9-10 million viewers that other networks would love to have in their lineup. Finally, I don't like any of the new ABC shows.
Anyway, I'm holding-out "some" hope that I'll like Grimm when it hits the airwaves and that NBC will somehow do something to make Prime Suspect work. I'll be watching Terra Nova tonight...but I get the feeling this one suck harder than a black hole. I hope that I'm wrong!