I've been recently been thinking about Arkane Studio's Prey which is a immersive sim, with a pretty good rogue like dlc, that probably has one of the strongest hooks of any game I've played. If you liked Halflife, System Shock, or Deus Ex it's definitely worth a play.
Are there any titles that might not have been commercially successful that you feel everyone should give a shot?
Played Uplink as a kid, later learned about fragmentation for computer memory. Was cool to find out the inventory system wasn’t just a cool game mechanic but was based off how actual memory works.