>>15263368
Ultima Underworld (1 and 2) and Arx Fatalis RIP Arkane ;_; are in the same breed of game as System Shock, and then there's Thief, Deus Ex and Dark Messiah if a game that's one-step removed from the concept (still fitting into the broader category of "immersive sim," but not System Shock's breed of immersive sim specifically) would work for you as well.
I wouldn't bother with Bioshock or ZeniMax Prey unless you want to be angered by how little the immersive sim had developed ten years after System Shock and even moreso by how little the immersive sim has developed twenty years after System Shock.
Given the current state of the medium - yeah, I wouldn't expect much from your average developer trying to make a "System Shock 3."