Borderlands 2 is chock full of humor that you don't usually see in FPSs. For Borderlands, backstory isn't too important so going straight for B2 is okay

For those who are looking for a long-haul game, Stardew Valley is for ya. You are tasked with maintaining a farm as well as becoming friends with NPCs.

In Team Fortress 2 there are objectives and points to capture but what makes the game worthwhile is the always evident stupidity. TF2 offers so much.