I think the Peacekeeper is a pretty great gun. Good damage, accuracy's decent, recoil's manageable (provided you fire in bursts) and it looks cool to boot. If you ask me, the Peacekeeper is the main attraction in this map pack because, aside from Chaos Mode in MW3, no map pack in Call of Duty offered anything else other than mere maps.
Have I ever told you the definition of insanity? Insanity is... doing the exact same fucking thing... over and over again... expecting shit to change. That is crazy.