That's actually a great question, what game has lived most in your imagination? I'm afraid I don't have the best answer, because I'm more Star Wars than man now, but KotOR was an oasis in the desert when it came out. More than Skyrim ever could, Morrowind delivered a totally foreign world, that really made me want to learn it's lore and immerse myself in the ways of the Dunmer. I don't understand why Morrowind is better than Oblivion or Skyrim, perhaps that transition from the known world to the weird. I really think that there is something to RPGs transition from outsider art to more mainstream fare that cordons it off from being too weird or objectionable. Disco Elysium is probably my game of this generation so far too, and it's weird but more weird in a pantomime stagey kind of way, not being fantasy.