roflmao
Mario 64 was great but going back and playing basically the first 3D platformer probably isn't going to go so well.
That said, I did briefly return to it at one point and was surprised by how well the gameplay and camera movement, etc hold up — shamefully better than some modern games at times.
The gameplay is pretty standard fare for 3D platformers: you complete quests in worlds to get items that're used to access more levels in the overworld. Granted it was basically Mario 64 that invented the idea but it caught on.
If you're looking for something similar from the same era but better: Banjo-Kazooie. Rare took everything great about Mario 64 and made it better, prettier, funnier, and it is just a fuckin' classic. Probably my favourite 3D platformer of all time.