For me, The Legend of Heroes: Trails in the Sky Second Chapter rekindled my love of jRPGs after I had fallen off of them for a while. I loved the genre in the PS1 era (mostly Square's games but I also loved Grandia, Lunar and Golden Sun) but eventually just lost patience with most of them.
I played and enjoyed the Ys series and the first Trails in the Sky but it was only last year when I played SC that I really felt those days come back. I put 80 hours into it in two weeks (was off for the Chinese New Year) and was enthralled the whole time with its writing, world, characters, music and strategic combat. I've since gotten into the Dragon Quest games and purchased and enjoyed Final Fantasy XV.
That's the big one, but Super Meat Boy and Jumper are what got me back into platformers and Burnout 3 got me into driving games after playing hours of OutRun as a kid.