Mario Kart 8 is a good call. Transcends all levels of the gamer population, appeal to kids, 'casuals' and neckbeards alike. And is a fun game to boot: SP, MP or with friends.

I'd put forward Alien: Isolation, finally an Alien game that doesn't suck! And The Talos Principle, at times it over-stretches itself and the soundscape is a little bland, but it's a well-crafted and quite beautiful puzzle game