Personally I played Metro: Last Light and the least that I can say is that was SHOOKED at how deep I got into the universe, checking the Gas mask, checking the Radiation and the likes. When I first started the game I was like wtf russian aliens? Wtf is going on? And then I started learning about what had happened in the first game and how that had affected the story in this entry and the stress of getting new masks and health... It was a pretty great experience and one I wasn't expecting (I dropped the game the first time because I was too scared to play it but eventually started it over again and finished it) But I can say one thing. Games that grab you by the neck and immerse you into the world like that, are a rare find. When you do find a game like that, then you know they're unique.