I have had the chance to play several hours of this over the last days. Stunning looking map. Having spent a month's holiday in Berlin and walking this route I think you've done a good job. Dark, desperate and gritty. Nice!
Gameplay wise it needs some work, I think. Tanks can rule the day. One round both sides' tanks just stayed back, sweeping the open ground with MG fire and pouring HE shells into the sides of the buildings, where infantry are always moving or hiding under the arches. The tankers got ridiculous amounts of points and it was no fun being infantry. I saw a tank only once and was killed by them many times!
Once the Russians are through the Gate, I really think there needs to be more cover in the huge open cobblestoned area. There must have been wrecks, rubble, sandbags, strongpoints, lightposts, benches, trash cans or something. Due to the lack of cover and concealment, most infantry just stick to the side walls and often it degenerates into a nade spamming contest there. It also suffers a bit from lack of variety along the walls.
Playing Germans on one server there was a terrible bug, spawning at their last position, very often one would spawn inside a building with no way out but suicide, or falling through the map. This was happening to everyone often and I'm amazed I seem to be the first mentioning it here.