What games have what you’d call really good worldbuilding, and what in particular do you like about them?
https://en.wikipedia.org/wiki/Worldbuilding
Worldbuilding is the process of constructing an imaginary world or setting, sometimes associated with a fictional universe. Developing the world with coherent qualities such as a history, geography, culture and ecology is a key task for many science fiction or fantasy writers. Worldbuilding often involves the creation of geography, a backstory, flora, fauna, inhabitants, technology, and often if writing speculative fiction, different peoples. This may include social customs as well as invented languages (often called conlangs) for the world.
As someone whose first TES was Morrowind, it set the bar so high in terms of worldbuilding, I was honestly a bit disappointed with the later entries into the series. Oblivion (more generic fantasy setting) and Skyrim (nordic with dragons) definitely played better, but the worlds were much less unique and memorable.