I played the BF3 coop, it's actually pretty good. There aren't many missions but they are great for repeatability as they have 3 difficulty levels to complete.
7 days to die
The forest
If you like survival/crafting games, I cannot recommend these two enough.
White noise is good for a laugh and a few jump scares, cheap on steam too.
CoD World at War Zombies
The first Templar - A pretty decent RPG which has 2 classes and is fun as it requires both of them to work together.
Portal 2
Farming simulator 15 if you like slower paced games.