So last night I played the DMZ Quick Play and it's great for topping your loot up and unlocking difficult to unlock attachments. I don't actually need any weapons cases but ended up with a lot of them anyway. The big gain for me was unlocking difficult to unlock attachments of mythic weapons. I think some people may have experienced something similar when they attached console controllers to play Building 21 bot lobbies. I don't want to get anything easy as the challenge is the big fun but this game can cost a fortune when buying weapons with just the right affixes and attachments so it's a relief to be able to do that quickly.
I highly recommend this to anyone new or with limited play time getting frustrated with getting killed by expert players in DMZ. The quick play option is usually just you and a bunch of regarded ai players who could hit a barn door with a nuclear bomb.