The layout of the whole campaign seems like it's the mapper's first time. The outdoors are blocky, confusing, and unfriendly to players. Here are the details of each map

Map 1 has no room for you to explore because of the gauntlet. It takes from start of the saferoom to another which gives you no time to scavenge. You have to move fast because the hordes won't stop and the special infected won't make the chapter easier.

Map 2 takes place at school and probably the best chapter in the game because of how detailed the school is. Though it has downsides like the classroom is very claustrophobic, bots have trouble going through it. Another problem is just like the first chapter, gauntlet again. First gauntlet is at the school and the second one is outside school where you shoot down a truck. With less ammo pile, it makes the gauntlet harder to go through.

Map 3 takes places in the sewers. Seriously when it comes to zombie apocalypse, why is it always sewers? I'd say this is the worst chapter in this campaign. Everywhere is claustrophobic, I get to fight two tanks, a panic event for an elevator, and poor layout at the end of the chapter.

Map 4 is spacious and so easy, I managed to survive the finale without taking damage. The finale takes place in an open area and what I say open area, you have eyes at every corner of the map and I feel bad for the infected because of this. They can't even get close to the survivors and if one has a sniper, it would be impossible for them to reach even two tanks. The helicopter part is quite weird because of how the helicopter moves. Idk if it takes damage when it hits you so that's basically it.

Overall outdoors really need a lot of polish. Second is lessen the panic events at least, make the chapters longer and make the outdoors explorable as well just like the first chapter. But with gauntlets happening, it defeats the purpose of it. 2/10