I can't decide between SCP:CB or Barotrauma.

I kid, worst I've probably played, or at least the one I have the worst memories with was Superman 64. I had it since I was 10, and I despised it with every ounce of my being. I tend to tolerate bad games if they are so-bad-it's-good levels of bad, but Superman 64 had no entertainment value whatsoever. Everything about the controls and gameplay was just clunky and terrible. There was also a time when I went to a summer camp and it was literally the only electronic game they had there (they would keep the N64 in the little indoors building). It made me go outside for once.

I might be biased because of its horrible impact on my childhood gaming memories. Wii also had 50 million godawful shovelware games, those of which I came into possession of about 6 years ago, so they didn't really have as bad of an impact. Still, they sucked shit.