Edit: I agree with the post above me, but anyway, here are my best classes.
I've aready posted my main class setup in a lot of other threads, so I am actually going to show here one of my back-up classes.
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SMG 1 (Named this one SMG P90TR, reference tothe good ol' P90 from COD4)
PDW57 Fast mags/Laser sight
KAP40 Akimbo
Lightweight
Cold Blooded
Ext. Conditioning
Semtex
Concussion X1
Pretty good rushing class. I use it when I get bored of the next class. P90 PDW57 i useful for Medium range combat, KAP40 is useful in close range encounters. It i like they are made to be used togheter
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SMG 2 (I named this class Yuyuko, and the weapon will have has cherry blossom camo on it. (Get it? No? AWWWWW... )
MSMC Laser Sight
NO secondary
Lightweight/Hardline or Flack Jacket (PERK 1 GREED)
Scavenger OR cold blooded
Ext. Conditioning/Dexetrity (PERK 3 GREED)
NO lethal
Concussion X1
UAV/CUAV (or Hunter Killer Drone)/Orb. VSAT
VERY good domination setup. You are imune to explosives, and can get to objectives quickly. Laser Sight helps since you don't have the luxury of aim while capping Domination points, and the concussion helps slowing down your opponnents.
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Assault 2 (AR alternate)
TYPE25 Laser Sight/Stock/Silencer (PRIMARY GUNFIGHTER)
KAP40 Akimbo
Lightweight
Scavenger
Extreme Conditioning
NO EQUIPMENT WHATSOEVER
Basically an SMG mentality with an Assault Rifle build. You may prefer the FAST MAGS instead of the silencer, but If you master Reload cancel like I do, there is no need for that, and I like the irons, so NO to Optics.