They're not garbage. They just have a pre-determined role that is weaker than in MW2. They can still be improved, sure, but you can still do well with them if you play them smart.
What kind of mush-mouthed equivocating is that? They're not garbage if you use them in their role and play smart?
Dual FMG9s aren't amazing, you can do well with a silenced USP .45 if you play well!
Shotguns in this game are objectively worse than the MW2 shotguns. They received a double nerf in the form of a reversion to primary only
and a reduction in statistical performance. On top of that, they are hindered again by the presence of a host of 100% stopping power enabled ARs and SMGs, several of which are insanely good, and have no significant downsides (MP7 I'm looking at you).
The ONLY thing that is keeping shotguns competitive right now is an apparent bug with extended mags giving them 50% more pellets. Combined with Damage, it makes the Striker (gasp) actually effective, particularly with the Specialist proficiency on smaller maps.
But go do 30 levels with the KSG, USAS, or AA12 and tell me shotguns are 'fine'.
Shotguns are stunningly inconsistent due to their low pellet counts, short range, and dependance on close range encounters that bring issues with the net code into stark light, barely match up well against a RF SMG, and are outright inferior on most maps, barring the choice to use Overkill and give up Assassin or any of the other strong red perks.
Yes, I'm bitter.