For me :
Best game of the decade? Last of us. A game of stealth, action and more so, emotions. Good RPGs have come and gone but this one hit every possible checkbox there is in a game.
Worst game of the decade? Anthem. Although I have never played it, just by the expectation of it and in the end, the tragedy of it. And ultimately, the publisher giving up on it. Has to be one of the most lulz in gaming history.
Biggest disappointment of the decade? Fallout 76. Much was expected after the success of the series and what a disappointment
Game that changed gaming of the decade? Last of Us
Game that you played the most? Division 2. Sank a lot of hours in this game this year. Worth it while it lasted
Soundtrack of the decade? Skyrim.
Story of the decade? Death Stranding. How it all unfolds with every episode.
Game that you will continue to play during next decade? Don't think there is a game like that. Maybe, destiny 2 or guild wars 2 but unsure.