The gameplay in Fallout 4 isn't that extensible or great though. I found it boing and repetitive, with poor voice acting and even poorer writing to go along with it. Not to mention a trashy story and extraneous gameplay elements that just felt tacked on, or the trash heap that is the Radiant quests. Yeah, the combat was more tight than previous games, but it's so simplistic and boring, with se weapons that are jus clearly superior, and little use for any of the consumables. There's little use for a lot of the features in the game, like settlements. The best part is just exploring the dense world, which does have good level design even if the world building leaves a lot to be desired. I got bored very quickly with fallout 4, yet a put a ton of time into NV. The gameplay in the Witcher 3 was much better to me, especially on higher difficulty levels where you actually need to plan out your oils, gear, potions and signs if you want to do well against some of the crazier monsters. Plus, it had good writing, voice acing, story, graphics, animations, meaningful choices, etc as well as a huge world full of shit to ind and do, and the only thing that really felt tacked on was the horse racing. Yeah, Gwent was out of place in the world but it was hella fun and fleshed out enough to make that not matter. Honestly, you can't even compare the two, Fallout 4 falls short in everything when compares to the Witcher 3 in my mind, and I can't wait for Blood and Wine while I could care less about Far Harbour.
Apologies for the spelling, I'm on mobile.