Weapons are spread evenly throughout the map, with a good supply of explosives. Another MP5 on the lower level would have been nice, but it plays well as is. The big guns all require a bit of effort to acquire. The egon is behind a button operated door which sounds an alarm when activated, letting everyone in the area know where you are. Getting the gauss requires you to hop on a small moving platform to reach it, which can be tricky when playing over a modem.
Water plays a large part here.
Most of the rooms are half filled with water. Walkways just above the surface allow easy access back to dry land. A pair of staircases and a lift are also available to get in or out of the drink. The underwater areas are fairly simple, making getting around easy. The downside to this is that there is little cover to hide behind.