I think this one was my favorite. There's an ingress bottleneck but not an egress one, so you don't get spawn camped and the sides see a fair amount of action. The invisible walls were a cute gimmick, but easy to learn and ultimately not very impactful. Even the raising/lowering invisible wall in the middle wasn't a big deal, you could walk right around it--although for some reason, when I stood on top of it, people kept climbing into my face while I was firing and dying instantly.