I like the suppressor, I feel safe when i'm using it with Ghost, it keeps me off the mini-map when shooting and I can be stealthy, get behind the enemy and take 'em out when they're busy shooting at my teammates. I also use Cold-Blooded which keeps me off target assisting scopes like the Target Finder, MMS, and Dual Band Scope. It also removes my name when an enemy looks at me, so they get no aim assist if they're using it.
Mainly, being undetected is how I like to play so i use what I can to be as undetectable as possible e.g.
no red dot when enemy has UAV / while moving.
No player name can be seen, remain undetectable to player highlighting equipment (as well as the Sensor Grenade)
I don't really need to use Dead Silence because it doesn't do a great amount in BO2, unfrotunately.
Smoke grenades are good for blinding enemies. Throw one at them to mask their vision and move through it without your name showing up.
Sorry for this turning into stealth tips but that's basically what a suppressor is for.