Vetos as Axis:
Moscow Outskirts and Winter version: We do not want to risk to spawn in North. It's almost impossible to win in Moscow North as Axis versus players of equal or higher skill due to the cut off being surrounded by buildings which on the one hand get garrisoned by foes and on the other hand impede your attacks. To defend fuel and cut off at the same time seems unfeasable to me.
Bystraya Voda: This map just does not fit into 2vs2 because it is too small, basically has no flanking options and only one fuel point. Luckily Bystraya Voda will be removed soon.
Rzhev Winter: Does not fit into 2vs2 either. Too large, much deep snow (very unfavourable for retreat paths...) and North position is ill. Should be removed from 2vs2 pool either.
Vetos as Allies:
Ettelbruck Station: Much close range combat included in this one but MGs are too effective here. Starting North is pretty hard for Allies since they cannot establish and defend positions as well as Axis.
Crossing in the Woods: Balanced map but too much long range. MGs and LMGs excel here as well as PaK40/43s and Raketens.
Rzhev Winter: Same reasons as above.
Bystraya Voda: Same reasons as above.