Well I'm up to 21 in AA .
Some maps are hard as hell just because of close quarters and your first impulse of pulling the trigger.
Weapons Cache is the hardest for me.
Pipeline and Mountan Pass are my favorites.
Little hint: Always chose to be leader...you get a toejam load of points even if you don't fire a shot.
I was getting 650+ points on the Bridge map and all I was doing was calling out E.