One thing I don't care for is the loot progression. I think it would be much better if at anytime we could find loot tiers 1-4 in the world. Then our Characters can with the required knowledge build the tiers 5 and 6. I hate that I can build, at best, a level 5 machine gun but someone else can easily find a tier 6 machine gun. It ruins the character progression.The only progression should be what knowledge the character gains. Well, except maybe the zombies. They should progress harder as each day or every 7 days that goes by.