So this is my first COD, and actually my first game since N64... It was a painful start (.2 K/D through my first prestige and .4 through my second, now up to about .9). I've got diamonds on the shotguns and just finished the SMGs, but they are pretty much all I've used. Over the weekend I tried to run some ARs, and I felt like I was running in the mud. I obviously need to adjust my playstyle to match the different abilities of the weapon class, but I'm not sure where to start. For months I've been running around the maps like a madman seeking out CQ encounters, and now I seem to need to dial it back a notch. I assume the class setups that will help me are somewhat different as well. Any tips you might have would be very much appreciated.