I have to say that personally I loathe this game-mode. To me it seems completely retarded when the best way to consistently do well in the mode is to simply run away from everything for as long as possible. Seriously, unless you get the drop on a wounded opponent or can pick off other guys already fighting each other, the best move is to simply not take any fights until you are at least Level 4, ideally Level 5. This is acerbated by the absolute bullshit armour profiles of most of the tanks where you get really weird random bounces on sides and rears with the low-penetration rounds, plus the vision mechanic where tanks are invisible unless you are looking at them, meaning that it is very hard to get away from someone who gets on your rear or engage more than one opponent if you get focus-fired.
If I didn't need the tokens to get at least one reward tank, I wouldn't even be playing it.