"What if we made Banjo Kazooie... but way too big?"
I admire the attempts at increasing scope and variety, but it leads to levels that are absolutely gigantic. Some worlds are a huge slog to get through because of this. The first time I played through the game I felt like I spent multiple play sessions just mapping out the multiple floors of Grunty Industries and how they link together. Also Cloud Cuckooland can go to hell.