I'm only a few hours in, but I really appreciate that there's not this sense of urgency to push the main quest forward to save the world, like in many/most RPGs I've played. Geralt has been on this quest for a long time, and he has time to sleep and just be a Witcher.
Juxtaposed with Mass Effect 3's REAPERS ARE EATING EARTH, and you're doing side quests of picking up peoples laundry.
The whole world is just more believable and grounded thanks to this.