

Oblivion is very systems driven, has better character building, more diverse gameplay, wasn’t afraid to let the player get a little silly, generally had better writing, they were less afraid of whimsy, and the world felt like it could exist without you. Skyrim felt like a theme park or movie set focused entirely around you and they were afraid to let you cut loose.
*All of this in theory, the level scaling made oblivion borderline impossible to play and it is still fundamentally bad in that Bethesda way.
Bethesda games get better the farther back you go, almost objectively until you get to Morrowind, only after that is it arguable.