For me it's close between 2010 (reveals for Donkey Kong Country Returns, Skyward Sword, Goldeneye 007, Kirby's Epic Yarn) and 2014. (BOTW, Splatoon, Captain Toad)
Ultimately I went with 2010 as 4 awesome new games > 3 awesome new games. XD
Bet with Liquidlaser: I say PS5 and Xbox Series will sell more than 56 million combined by the end of 2023.