Most of the video games I’ve played were pretty good. The only one I can think of that I didn’t like was MySims Kingdom for the Nintendo DS. Dropped that pretty quickly. It was a long while ago, but I’ll guess it was because there were too many fetch quests and annoying controls.
Maybe not the most unfun game I have ever played (I’ve played games since the late 90s), but certainly the most unfun I have played in recent years: Elex.
I liked Piranha Bytes’ old Gothic series a lot despite its weaknesses and idiosyncrasies. The Risen games weren’t that great, but the reviews for Elex were pretty promising. So I gave it a shot, and tried for about 16 hours to find the fun in it. I stopped playing when I realised:
So yeah, no fun to be had with this one.