The most recent game to genuinely amaze me was Steins;Gate. It's not exactly swimming in interactivity, but the story is really good. Really, really good. Like, 'well shit, I've been sitting here reading for 14 hours' kinds of good.
Prior to that both The Last of Us and Bioshock Infinite blew me away, in quick succession. Over time i grew to like TLOU more (through subsequent playthroughs, and trying out the online), but i loved every second of my 1st playthrough of both.
Over the last year and a half I've been mostly focused on working through my backlog, but i did pick up Fallout 4, and was pleasantly surprised by it. It didn't 'amaze' me, but i did end up enjoying it a lot more than i was expecting. I'd actually hoped to be done with my backlog by the end of 2015, but i ended up sinking 40 - 50 more hours into it than i'd planned, which put me behind :p
