No, the multiplayer version is in a big city where you can roam freely. You gain aggro the more zeds you shoot making more come to that spot. Also, you can go inside buildings and look for loot, as well as barricade the doors up so they cant get in. You can also capture buildings and make your very own outpost.
It's pretty cool...
I'm a level 11 character already, and I'm specialising in shotguns and melee
~Sol