Dishonored. I absolutely love this game (the first one) and still find myself thinking about it and going back to play it from time to time. The atmosphere and the music was unparalleled. The powers are so much fun, the lore is intriguing and the locales great to explore. Dishonored 2 also had some moments of brilliance (Clockwork Mansion and A Crack in the Slab *chef’s kiss*) but for whatever reason didn’t impact me the way that the first did.
Also, someone mentioned The Witcher could be classed as gen 7 gaming wise and as The Witcher 3 is my favourite game of all time, I have to mention this also. I haven’t played 1 or 2, but I’m looking forward to the remake.