Almost certainly World of Warcraft. I don’t think I even liked it for most of the time I spent playing it. I’ve been annoyed about the overall direction since basically Cataclysm, and IMO Burning Crusade laid the foundations for most of my major complaints, although I didn’t realize it at the time. I have decided that I’m opposed to the “expansions add a new tier of everything that invalidates old content” model of expanding games. If creating diverse content that is still enjoyable at level 60 is too hard, then maybe games just don’t need to be expanded indefinitely past their original level caps.