Wow, just wow. They were utter **** in MW3, sub-par in BLOPS, balanced in MW2 (save the pre-patch dual-wield sniping 1887s, that was OP), and balanced in MW1. Finally comes a game where shotties are a very great choice to counter the almighty SMGs that are always used in every CoD, and people start crying about it? Get real.
Mw3 shotguns were great. The problem is that lag is a shotgun's worst enemy and mw3 was just full of it. The long shots you could get with the pump actions, or hell even the usas seem to be double what you're capable of getting with the remington in this game.
imo, the shotguns are definitely underpowered in this game, but still usable.