Brumbar is hard to vet, it do low dmg to vehicles and it need a lot of infantry kills to lvl to vet 3.
It does 160 dmg on penetration, as any other tank and 80 dmg on deflection, 80 more then any other tank.
It also have pretty decent penetration, high enough to pen all med tanks reliably except ez8.
It beats by a long shot dozer sherman in AT while having better AoE for AI.
The two things people can complain about here is armor OR range and pathing.
Brummber doesn't get half the credit it deserves.