1. Super Mario Odyssey (5p). This is the best 3D platformer I've played since Super Mario Galaxy. While the Cappy gimmick seems weird at first when looking at the previews, it actually works very well. Solid level design, impeccable gameplay, and a good variety of levels help make this not only my Game of the Generation so far, but my Game of the Decade.
2. Halo: Reach (4p). Bungie's final Halo game was arguably their most well-rounded and definitely their most feature-rich. It had the best overall core gameplay of the Bungie-era Halo games, and while the Campaign isn't as fun as CE's was, it was still better than Halo 2 or 3's. Really, there are only three real complaints I have: 1) the story, which retconned the last third of the novel The Fall of Reach, 2) the armor lock, and 3) the jetpack. Other than that, solid 9/10 game.
3. Doom 2016 (3p). This kinetic, frenetic, balls-to-the-wall reboot of the classic FPS series was some of the most pure fun I've had in a shooter this decade. It combines the best of classic Doom with some more modern touches and some gameplay additions that encourage aggressive in-your-face combat.
4. Mario Kart 8 (2p). Honestly, I found this to be the most fun I've had with a racing game since Mario Kart 64, especially now that they have a proper Battle mode in the Switch version. Mario Kart has always been a simple yet fun racing game series, and MK8 is to me one of the best Nintendo has made so far.
5. Resident Evil 2 Remake (1p). This was hands-down the best full remake I've played in a long time, perhaps ever. It modernized certain parts of the old RE formula, most notably the controls (I absolutely hated tank controls in the originals), while still keeping the atmosphere and intensity of the original, and I hope it sets the standard for the franchise in the future, including for all other remakes of classic RE titles.
Honorable Mentions: New Super Mario Bros U (top-shelf 2D platforming), Breath of the Wild (solid if flawed Zelda title), Mega Man 11 (an enjoyable outing with the Blue Bomber), Alien: Isolation (finally, a good Alien game), and The Last of Us (decent survival horror with a great story).