I love RPGs such as the Elder Scrolls-series, I also enjoy open world-action games (the Grand Theft Auto-series, Red Dead Redemption and so on) but my fav game would probably be the S.T.A.L.K.E.R.-series. It has pretty much everything that i like: Open world freeroaming, FPS-gameplay, Roleplay-elements such as weapon-customization with different attachments/Customizing your own character with different outfits and armor, Aswell as a rich, Interesting story that gets you hooked rather quickly. But what really makes me love S.T.A.L.K.E.R. (all of the games) is the atmosphere (or should i say atmosfear....?), It is absolutely spot-on. The ambient sounds are great and can really send shivers down your spine from time to time. The nights in the games are usually really dark, So you will not be able to see very well. Should you decide to turn off your flashlight it will be almost pitch black and you will not be able to see anything. That, Combined with the fact that mutants can come for you at any time - anywhere in said pitch black darkness of the night really makes you want to get inside a shelter fast when the darkness falls. That's my 2 cents on S.T.A.L.K.E.R. which i suggest you check out if you haven't already. I suggest trying Call of Pripyat with the Misery-mod. :)