If you're going to compile a list of games that haven't aged well, System Shock would be a good first entry. The interface is the most arcane I have ever used in a game, which on top of early 2.5D FPS technology made starting this game comparable to running into a brick wall. I could see it being too much to get over for most people, but if you can commit, you’ll be surprised at how good this game still is. The crux of its quality is its infamous AI villain, SHODAN, and how beautifully she(?) frames the entire game. With the gameplay being about exploring a space station, having the antagonist be a personification of the station’s malice keeps the narrative feeling present, and all your victories are direct shots against your enemy. Pulling apart the station for resources isn’t just something you do to increase your strength, it cripples SHODAN’s control and turns the tables in your favor. It’s beautiful ludonarrative synchronicity, a quality I feel was lost as subsequent games simply copied the format. The Bioshock games also have you repairing and reclaiming your environment, but with villains disconnected from the setting itself, it can feel like a tedious distraction before the real conflict begins. Playing System Shock will give you so many little revelations like this, and you begin to understand where so many design tropes in successful first-person shooters came from. I recommend at least trying it out, even if I fully expect a lot of people to bounce straight off of it.