Wut's ur perk set? I know you've probably been asked a hundred times, but haven't seen one on the front page.
Mine:
Frags X3
Sleight of hand or stopping power
Deep impact

I use just about everything depending on the mood I am in. The only one I consistently use is UAV Jammer.

C4
Juggernaut
Steady Aim

Bandolier
Stopping Power
Steady Aim

Assault guns is Bandoleir or Claymore x2 (if i feel like camping), Stopping Power, Matrydom or last stand.
Sniping is Claymorex2, Stopping Power, and Iron Lungs.

Bandolier

I have a few different setups depending on the map and how im feeling. A close range, long range, and wall spamming RPD.
I use all the "cheap" ones though because i prefer winning than losing.
Just basic stuff like matyrdom at close range. Juggernaught.
I tend to go with the 3x frag also because im dam good at killing people with them and they are good for flushing people out. If i see a group of red dots i spam like crazys.