So, I've played this map quite a bit, and I rather like it. To me, Rochester feels like an actual siege or at least it captures the feeling of what I imagine a siege would be like. Pardon me for saying, but that gets me freaking hard! Personally my only gripe about this map is that the offense spawn is a bit to far away from the walls at the start, and sometimes no one spawns near the siege tower so that point of access is delayed by quite a bit, also I recommend removing the back door since it makes the front ladders and siege tower almost unnecessary. (for the record it's quite a bit faster to get in through the siege tower and even quicker to hop up that front ladder.)
Also, the whole hype about Rochester being defense favored is bullshit. I mean, you build castle, and I would certainly hope that the walls, stairways and fortifications are built in such away that the garrison is, dare I say, at an advantage!