The best way to own in this game.

Use hardline pro, set killstreaks to SAM, care package, and sentry gun

Get all 3 of your packages and call them in. Use hardline pro to switch the package if you don't like what you got. For instance, I've switched 'ammo' for 'attack dogs'. I typically switch all 3 packages (unless we need a SAM turret).

This technique will help you dominate. I've got almost 5000 kills with a 2.2 k/d ratio - nuff said.