It's some comfort at least that you absolutely must used combined arms tactics when assaulting strongpoints like MG nests, bunkers, or bridges. Send out sappers to get a bead on a squad of Russian KV-1 tanks, for instance, and you'll suddenly have extended visibility for your Flak cannon to snipe them from beyond their firing radius. You can also call in airstrikes, capture undamaged enemy weapons and gain visibility advantages by strategically positioning soldiers in buildings near enemy-held areas.
On the other hand, the computer AI stinks on the offensive. The manual's suggestion that it "will try everything to put you in a pocket" is laughable compared to the mini-clusters of infantry and armor that burp into action in bursts rather than organized lines. Worse, the dumb pathfinding combined with MtB's constricted urban environments lead to vehicles snarling on buildings or each other like "wide loads" in rush hour.