Urban defense is totally OP on maps as Semoiski. It pretty much gives you an indestructible fortress in the first 7 minutes, including an aura and healing. Even Paks and flamethrowers as well as mortars need incredibly long to take buildings down. Add to that the blob of infantry that strives around the forward HQ swarming out as soon as a unit fires on the HQ and they struggle even more.
By the time the Stuka arrives you should have made good use of that ability.
Well, I would be inclined to agree if Soviets didn't depend on call-ins to have any viability in their armored forces.
Also Semiosky? Everything is wooden there. It's not a good urban defense map at all if you have a Wehrmacht ally. Trois Ponts and Ettelbrück Station however... Tears will flow.