I'm seeing a lot of Metal Gear Survive popping up, but after playing it myself, I can't see how it could be considered the worst game of the year, especially when we have Fallout 76 and more specifically; Atlas, on the list.
I mean, the only thing I can think of that would make Survive one of the worst games of the year is that they've literally made up some bogus story and stuck the "Metal Gear" name on the game for extra sales. The game itself works fine, it does some things really well, some things not so well, but it's not exactly the broken pile of shit that is Atlas. That game is borderline unplayable and a bigger disappointment than No Man's Sky was at launch, at least when that game came out it was playable and didn't have half the glitches and bugs that Atlas has. It's basically Ark reskinned, and I'm pretty sure Ark still isn't "fixed" yet either, lol.
TL;DR - Atlas. I'm sorry but there is no other correct answer in my mind, lol.