General

They're a bit older, but the Left 4 Dead games are fun. Assassin's Creed can be fun, but can also be grindy/repeating.
Skyrim has withstood the test of time IMO.

The Metro: Redux games are pretty amazing.

Also, if you have a buddy, you could try Octodad: Dadliest Catch for some pretty damn hilarious times (only works for local coop though).

DOOM is amazing as well, been having lots of fun with that.

Also, if you're up to the challenge, the Dark Souls games are supposedly really good (I've only played parts of the first one though).