Most recently was The Witcher 3. No game that I have ever encountered can touch TW3's depth. It's insane! The world is huge yet beautiful and varied. There are so many small and individual stories happening that you are guaranteed to forget about the main quest of the game - if but for a few minutes.
Going from Fallout 4 to this - in terms of quests for one example - is like comparing a two year olds' crayon drawing to Da Vinci. Fallout is like "YO HO IM PRESTON GARVEY, I'M DEFINITELY NOT THE SAME AS WHITE PRESTON GARVEY AND FEMALE PRESTON GARVEY AND SYNTH PRESTON GARVEY" - and no matter what choice you make you'll always end up shooting things with guns and fetching material. In the Witcher 3, simply following the main quest shows you all these fully-fleshed out stories from all kinds of places. For example, the sub-plot of Keira Metz, in which she banged me and then tried to kill me within 10 minutes. Or the Crones of Brookback Swamp. Or the plot surrounding Radovid. So much stuff you just want to know more about.
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