Shenmue I and II
While they were technological marvels at the time that created immersive and lifelike worlds unlike anything seen before in gaming, they are incredibly user-unfriendly and I honestly don't think I could ever go them now, the gameplay is so obtuse and clunky by today's standards.
The art style is gorgeous and I loved it back in the day, but nowadays there are a mountain of annoyances from the fiddly implementation of the paintbrush to the slow dialogue that add up to make it more frustrating than fun.
Bet with Liquidlaser: I say PS5 and Xbox Series will sell more than 56 million combined by the end of 2023. (And over 130 million lifetime)