I run and gun about 80% of the time, then the rest I'll camp an objective till we have a decent lead, then run and try for a scorestreak or two!
I usually skirt round the edges of the map to reduce chances of cross fire or being snuck up on, helps me keep that K.D above 1.0

The two main classes I use are:

Asm1 - Rigor (+2 acc, -2 hand). (quickdraw grip, adv rifleing, laser site)

low profile, blind eye, blast sup & hardwired
exo overclock
UAV - threat det, speed, xtra time
System Hack - disable exo, disable scoresteaks, xtra time
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ASM1 - Rigor (quickdraw grip & advanced rifleing)
low profile, blind eye, blast sup & hardwired
exo overclock
UAV - threat det, speed, xtra time
Aerial assault drone - AI control & rockets
Warbird - Aggressor