I never get tired of Super Mario 64, but Yoshi's Island got old for me very quick in a hurry, and i didn't like it.
Yoshi's Island is so cheap: so many cheap enemy placements and bad level designs, just frustrating egg shots and i was not having fun especially towards the end.
I just don't like Yoshi's Island, and I don't like Yoshi's Story either. I think Yoshi's Story is even worse.
I don't like Yoshi's Island for being too hard for the wrong reasons, and I don't like Yoshi's Story for being too easy for the wrong reasons.
IDK maybe I just don't like Yoshi or Yoshi's games.
I think Yoshi's fine as a character, it's not him personally, but it's just Yoshi's games are bad, and that's why Nintendo didn't make a lot of Yoshi-centered games.