Here's a quick fix!
Step one: Get a Wirble or the dreaded OSTYOFDDDOOOOOOooooooommm.
Step two: Start the Wirble up and drive it out.
Step three: Leave the Wirble in 1st gear and let it keep moving at about 5mph.
Step four: When a bandit approaches from a direction in which your turret is NOT facing simply use your rudder controls to turn the tank around until your guns can be brought to bare.
Step five: Blast enemy before he gets you.
Step six: Woot!
See.....easy as pie.
Also Wirlbe users should note that hitting moving tanks with bombs, rockets and to a lesser extend bullets is slightly harder when you're moving then when you're sitting still.