I'm with Rilder, got both the previous games, don't see the attraction. I remember coming to some junkyard in the first game, helping a few guys defend, and then scavenging for ammo and weapons. While doing that, more baddies show up and keep showing up; unlimited spawns for enemies never fails to kill a game for me.
The second game was just weird.
Still curious about the new one though. Series has potential, maybe this one has some overhauled mechanics.