For me it’s Deus Ex Mankind Divided. I played the original when it was new but barely remember it and I owned shadow war and never got into it.
However Human revolution blew me away. I loved that game so much. I still think about it and actually am making this post because I finally started cyberpunk last night and got human revolution vibes like crazy.
However I bought mankind divided on my birthday when it released. Happened to be right around the same day. I turned it on, walked a few steps and turned it off. For whatever reason I’ve never turned it on again.
Mankind Divided was in my backlog for years too, lol. I finally restarted my game and got around to playing it just a few months ago, and I highly recommend going back to it. I forgot how much I love playing Deus Ex games (especially going back with much better hardware). There’s a bunch of hoopla about it being half a game, but it tells a complete arc IMO, even if it’s got tons of sequel hooks left for future games.
For me it’s probably all the PS4 greats like Horizon, GoW2018, and RDR2. Not to mention the sequels lol.