Multiplayer is a lot of fun… if you can find someone else online. Even on weekends, there are very few people playing online.
It also doesn’t help that multiplayer games do not have drop in/drop out AI replacements like Payday 2. I am sure more people would host multiplayer games if the AI buddies start with you when no other humans are around. Right now, it is just you, alone, by yourself until another human joins your game.