i had a 2.5 k/d ratio before i even unlocked a tank. i didnt even care about my k/d ratio until around level 50 when someone asked what mine was. put it in passive mode to avoid being spawned killed by a twanker then stand out of their reach. if you time it right you can jump out of the way of a charging tank and swinging turret. and boy does that piss off the guy in the tank.
just because they are in a tank doesnt mean they will get a lot of kills. you have to be pretty stupid to keep getting killed over and over by the same guy in a tank. you get killed more than 30 times chasing the twanker down and then leave the session after you killed him once. you didnt win anything you just screwed up your own k/d ratio and made a new arch enemy.