You have not seen 'worst ever'. I call your game and raise you Descent to Undermountain.
A sad game, really. Some fantastic developers, but the entire project went awry, and they ended up releasing something that wasn't even close to alpha, much less finished. I panned it. Another reviewer I know, who fancies himself an intellectual (and got a game reviewer published once by the New York Times, which of course proves it) thought it was magnificent because you could climb into windows.
My most noteworthy piece of trash, however, would be Ring. It was a French graphical adventure (published by Cryo Interactive) that featured Wagner's Ring Cycle for its music, and made so many basic errors of judgment as to be laughable.
Imagine clicking on a door only to be told the next second you plummeted to your death, because there was no floor on the other side. And had to reload.
That might have been acceptable back in 1982, but not in 2000. The puzzles were awful, the graphics a shambles, the content meager. The publicity discussed the developer as though he were a combination of Gandhi, Rasputin, and Einstein.