Not sure if someone else posted this in a different area, I wasn't quite sure which area this would go in, but this forum seemed to be the most appropriate.
My feedback is from an experience in a game last night. The game last almost a couple of hours because our team wasn't able to destroy the enemy teams guard tower (Nob Obleisk). Our team had taken out their refinery, barracks, and airstrip, however we couldn't finish the job because no matter how many Mammoth tanks we had, we couldn't get into the base to finish the job on the Obleisk because they had so many engineers camped in the tower just repairing it. Same thing with the power plant. At one point we had 6 mammoth tanks attacking the Obleisk, and they had no vehicles and the Obleisk wasn't able to destroy all of us because we couldn't do any damage to it, because of so many engineers
My feedback would be to limit the maximum repair rate on buildings. Engineers should not be able to make a guard tower unkillable to 6 mammoth tanks. That should be a quick base destruction with no problem at all, especially if the other team doesn't have any vehicles to guard it or fight back. This problem made the game very very long for no reason, and to be honest after close to 2 hours of dealing with this, I just left, I don't know if my team was ever able to finish the base off.