Dying Light's currently scratching my open-world RPG itch, once you get powered up, a few of the upgrades and the grappling hook the free running stuff is just so much fun. Not sure any game has given me such a great feeling just from traversing the environment.
I'm really craving a more open-ended experience, though. I wish some developer would have the balls to make an intricate open world that you have to exist and survive in, but where the story emerges from the environment and your interactions with it, rather than via a traditional video game narrative structure. Practically every open-world game I play I end up thinking "this'd be so awesome if it was more of a sim" and that goes for Dying Light and games like Red Dead as well. Don't do a disservice to the detailed and rich world you create by then forcing players to slog along through your idea of an exciting story.
Off on a tangent slightly, but that's a big part of why Morrowind's my favourite open-world game ever. You're dumped in the middle of nowhere with no map, no money and few instructions and even if you do try and follow the story, you're explicitly told to just go off and do your own thing, for as long as you like. Skyrim & Oblivion sucked.
Lastly, to end this rambling post about nothing in particular, unpopular opinion time; Fallout 3 > New Vegas. Sure, the writing was shittier, but I far more enjoyed the world.
