As the title says, so far from my results (level 6) attackers win roughly twice as often as defenders. I played enemy territory and rtcw the games that started the whole objective based map concept ( I want a beach remake and ill pay money for it).
My issue so far is that its just too easy on the attacking side, in ET on well designed maps defenders had a buffer to the enemy. for example goldrush the map that inspired the whole EV thing. its quick to get the tank repaired normally, but getting the tank to the second barrier takes quite a bit more effort than getting the EV to its destination. more importantly it required the attacking team to flank the defenders, the tank took the main road with medics and engineers and maybe a field ops to call in artillery. At the same time the rest of the team would attack the balcony the axis would use from the side using the hallway / side route. this required the attacking team to split their forces or be pummeled by artillery if they all tried to push down the main road.
So far as i’ve seen in dirty bomb you can just brute force every objective as an attacker without flanking ,etc as the map doesn’t give defenders good defensive position like ET did.