watch your radar. red dots moving at you are very bad.
other then that, stay low. when entering a combat area, take out targets with missle attacks first. start with turrets, SAM's (grab them and give them some of their own medicene) then gunships (hellicopters and VTOL aircraft) then smack down the fighters.
missles are your biggest threat in the game, it's serves well to target them first. also, enemy's who have missle attacks cannot launch missles at you if you are within 80 yards of them. (check your hud when locked on for distance read out)
other then that, chaff and sheilds are extreamly usefull. and when your radar is full of dots, grab an enemy and you should be safe from the barrage.
Make xbox live cost more!