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?
Wildermyth is just so endearing I loved my time with it.
Taking the same character through each campaign was pretty fun like I was making a serialised demi-god: Doofus and the mountain horde, Doofus and the ancient threat etc. Because characters age though the campaign, it has interesting implications in the world lore. Like we're an archivist document the various legends of Doofus, acknowledging where they contradict and maybe speculating on how the differences in each culture's legend of Doofus reflects back.
Downside is I optimised the fun out of the combat in always having Doofus at the center of the strategy, each encounter then played out the same.