Mind if I start? I have played quite a few. Mine is something rather old, and it’s not even particularly well suited for the Rift. But I got so lost in it back then that simply walking around in it brings up many fond memories, multiplied by the Rift-Factor.
What is it? Elder Scrolls: Morrowind (with the gorgeous Morrowind Overhaul Mod Collection). Simply beautiful.
Skyrim thus far. I just got some serious chills. I decided to start over and during the opening scene I was attacked by some giant spiders. Those things now look like giant hairy creep monsters. After that I just got lost and started wandering around looking at mountains and rivers.
Mass Effect 3 is perfect out of the box. I cried when I saw the reapers invade, and it occurred to me that each of those buildings was full of people.
Bioshock Infinite is close, but I need to tweak the FoV some more before I’ll believe I’m there. There’s just the tiniest bit of fisheye and it bugs the hell out of me.