To this day, the level of support this game receives is astonishing to me. I use The Witcher 3 to calibrate any new screen I get and make sure native resolution is set up correctly. No other game does this so accurately. It's not just a great game in terms of gameplay, but the story is still among the best in any medium. Just play it already if you haven't. For the culture.
Straight up, I've played and beaten ETG in 4 separate platforms over the last 8 years. The game is addictive once you start figuring out its secrets and use the official wiki to know what each item and gun does. Seriously one of my fav games of all times, can't recommend it enough.