msmc and pdw-57(?) are the best weapons!
hardline, ghost (lightweight if you donīt have ghost)
scavenger (toughness if you donīt have scavenger)
dexterity (maybe another perk if you play with headset)
with the perk1 or the 3 attachments wildcard
scorestreak: thunder strike, the reaper thing (donīt remember the name now), dogs/swarm
smr is also nice, but smgs are better in bo2
i have to try shotguns now
in bo2 you can play the same way on every map and gametype, at least with this class
kill confirmed is the best one to rank up!