u will thank me for this..
Best AR- ACR or if it doesnt fit u, SCAR (M4 is the overall best for me)
Best LMG- RPD + grip
Best (overly hyped) SMG- UMP; i dont find myself comfortable using it. i dont get as many killls nor any of the sub machine guns.
secondary- either shotgun or machine pistol- aa 12/spas + grip or pp2000 silenced
perks- marathon or bling
stopping power or hardline
ninja
semtex/frag
flash
painkiller or martyrdom
uav, predator, airstrike/harrier
p.s
choose the BEST, most comfortable sensitivity level for u. <--- this is important and most people dont take seriously and dont think to much about when they are doing poorly and want to improve. i suggest putting it up a level.
report back in a week and ill see how much better u performed