There’s definitely weird year of release biases. Older games, like older movies, tend to have inflated scores because they get rereviewed/no one is uploading the 1998 equivalent of this play dot co dot rs 75/100 review that Mario Odyssey received:
“Though a really neat game, Super Mario Odyssey is an utterly underwhelming adventure for every long-term Super Mario fan in existence. Unless Cappy brainwashed you. In that case, you are a satisfied zombie customer now. No, seriously, only a zombie would find a healthy challenge in this pleasant but disappointingly easy Super Mario Walk-in-the-park. Sorry - Odyssey.”