The terrain there is awful, the only real cover you have is the bunker, and the only way to it from the north (the side with the least bots) has a valley where they shoot at you from above, and even if you reach it it requires a lot of firepower to neutralize.
Yes, the ramp doesn't move at all, and it starts in the open position, I've played on deployment and their boats work normal. (this issue has been around for a few patches now - feels like it was "made" so that the bots can exit the boats)
Yeah, my bad, Castle Road has some cover in the form of rocks and they come from only one direction so it is a little tough but doable, but there is 0 cover when moving to the Barn, only bushes, and the terrain doesn't help either. Usually dump a lot of smoke so that we could even get near it.