Some great games (and books :D) mentioned already. 

I'm a huge Crusader Kings 2 fan, despite the fact I hate games that DLC whore. But now I'm sad to say I own practically all of them. But so worth it, since the days of Elder Scrolls: Oblivion I've not sunk so much time into any game. 

I'll say Faster Than Light is awesome but tough. Love all the differnt styles of play you can adopt. If you like that try Reassembly. It's a very different game, but similar kinda vibe and very good. 

Been playing Battlefield 1 recently. First dip into that series and it's pretty good indeed. Very pretty and cinematic, as well as a pretty decent teamwork based shooter.